Một người gánh một gánh nước . Thùng thứ nhất nặng 20kg , thùng thứ hai nặng 30kg . Gọi điểm tiếp xúc giữa vai với đòn gánh là O , điểm treo thùng thứ nhất vào đòn gánh là O1 , điểm treo thùng thứ hai vào đòn gánh là O2 . Biết OO1=90cm. tính khoảng cÁCH OO2 để gánh nước cân bằng
giúp mink với

Bạn An vào siêu thị mua nho. Giá một kg nho là 60000 đồng. Nếu x là số kg nho bạn An mua và y là số tiền bạn An cần phải trả.

1. y có phải là hàm số của x không?
2. Viết công thức hàm số y theo đại lượng x.
3. Tính số tiền An cần phải trả khi mua 8 kg nho.
4. Tính số kg nho bạn An mua được với số tiền 960000 đồng.

Question 8: Choose the word that best fits each of the blanks in the following passage. Write your answers in the numbered blanks provided below the passage. (0) has been done as an example. (10point)

Vietnamese generally shake hands when greeting and parting. Using both hands shows respect as does a (71)______bow of the head. In rural areas, elderly people do not extend their hand are greeted with   a bow.  Women are more (72)______to bow the head than to shake hands. Vietnamese names begin with    the family name and are (73)_______by a given name. For example, in the name Nguyen Van Due, Nguyen is the family name. People address (74)_______by their given  names,  but add  a title that indicates their   perceived (75)_______to the other person. These titles are family related rather than professional. Among colleagues, for example, the (76)_______of the two might combine the given name with the title of Anh   ("Older Brother"). A(n) (77)______greeting combined with the given name and title is Xin chao ("Hello."). Classifiers for gender and familiarity are also combined with the greeting. In formal meetings, business cards are sometimes (78)_______on greeting.

Vietnamese people have a strong (79)______of hospitality and feel embarrassed if they cannot show their guests full respect by preparing for their  arrival. Therefore, it (80)______to visit someone without    having been invited. Gifts are not required, but are appreciated. Flowers, incense, or tea may be proper gifts for the hosts. Hosts also appreciate a small gift for their children or elderly parents

71. A. light                            B. slight                                 C. lightly                    D. lighted

72. A. possible                      B. capable                             C. probable               D. likely

73. A. continued                   B. chased                               C. followed               D. taken

74. A. each one                     B. one other                          C. one the other        D. one another

75. A. relation                       B. relationship                      C. relation                 D. relatives

76. A. younger                      B. most young                       C. youngest               D. young

77. A. easy                            B. basic                                  C. fundamentally      D. elementary

78. A. changed                      B. transferred                        C. reserved                D. exchanged

79. A. sense                           B. sensation                          C. sensitivity             D. sensible

80. A. inactive                      B. inaccurate                         C. inappropriate       D. inexact

Question 7: Read the following passage and choose the best answer. Write your answers in the numbered blanks provided below the passage. (20point)

As Christmas evolved in the United States, new customs were adopted and many old ones were reworked. The legend of Santa Claus, for example, had origins in Europe and was brought by Dutch settlers to New York in the early 18^th century. Traditionally, Santa Claus - from the Dutch Sinter Klaas - was depicted as a tall, dignified, religious figure riding a white horse through the air. Known as Saint Nicholas in Germany, he was usually accompanied by Black Peter, an elf who punished disobedient children. In North America he eventually developed into a fat, jolly old gentleman who had neither the religious attributes of Saint Nicholas nor the strict disciplinarian character of Black Peter.

Santa’s transformation began in 1823, when a New York newspaper published the poem A Visit from Saint Nicholas, which Clement Clark Moore had written to amuse his daughter. The poem introduced many Americans to the story of a kindly saint who flew over housetops in a reindeer-drawn sleigh. Portraits and drawings of Santa Claus by American illustrator Thomas Nast further strengthened the legend during the second half of the 19^th century. Living at the North Pole and assisted by elves, the modern Santa produced and delivered toys to all good children. By the late 19^th century he had become such a prominent figure of American folklore that in 1897, when Virginia O’Hanlon wrote to the New  York Sun newspaper asking if Santa was real, she received a direct answer: “Yes, Virginia, there is a Santa Claus”.

61. Who brought the legend of Santa Claus to the USA according to the passage?

A. Sinter Klaas         B. Saint Nicholas                 C. A German             D. Dutch settlers

62. Santa Claus was traditionally described as a________.

A. tall man who could walk through the air.        B. fat, jolly, old man.

C. religious figure.                                                   D. fat man riding a white horse.

63. Santa Claus in North America was depicted as________.

A. a man with the strict disciplinarian character of Black Peter.

B. a good old man with less religious character.

C. one with religious attributes of Saint Nicholas.

D. a jolly man on horseback.

64. Who was Black Peter?

A. an elf accompanying Saint Nicholas.               B. an elf who rode a white horse.

C. one of the disobedient children.                        D. a popular traditional figure.

65. What word is closest in meaning to “attributes”?

A. symbols of a person        B. natural qualities   C. effects       D. outer appearance

66. Where did the legend of Santa Claus come from?

A. the North Pole     B. Europe                  C. North America     D. the City of New York

67. 1823 was mentioned as a year when________.

A. Clement Clark Moore wrote his first poem

B. Clement Clark Moore’s poem made him popular

C. Saint Nicholas visited New York

D. the image of Santa Claus was transformed

68. According to Clement Clark Moore’s poem

A. Santa Claus had nothing different in appearance from the traditional one.

B. Santa Claus had wings and could fly.

C. Santa Claus liked poetry.

D. Santa Claus was a kindly saint who flew over housetops in a sleigh.

69. The answer “Yes, Virginia, there is a Santa Claus” is an illustration for the fact that________.

A. the New York Sun was popular with children.

B. Santa Claus was a prominent figure at that time.

C. newspapers are unreliable.

D. Virginia O’Hanlon was a reader of the New York Sun

70. Which of the following statements is TRUE?

A. Santa Claus was an imaginary old man created by artists based on traditional figures.

B. Living in the North Pole, Santa Claus visited children at Christmas.

C. Santa Claus was a real figure living in northern America.

D. Santa Claus was a story based on Saint Nicholas and Black Peter.

Question 6: Read the following passage and choose the best answer. Write your answers in the numbered blanks provided below the passage. (20point)

In addition to the great ridges and volcanic chains, the oceans conceal another form of undersea mountains: the strange guyot, or flat-topped seamount. No marine geologist even suspected the  existence of these isolated mountains until they were discovered by geologist Harry H. Hess in 1946.   He was serving at the time as naval officer on a ship equipped with a fathometer. Hess named these truncated peaks for the nineteenth-century Swiss-born geologist Arnold Guyot, who had served on the faculty of Princeton University for thirty years. Since then, hundreds of guyots have been discovered in every ocean but the Arctic. Like offshore canyons, guyots present a challenge to oceanographic theory. They are believed to be extinct volcanoes. Their flat tops indicate that they once stood above or just below the surface, where the action of waves leveled off their peaks. Yet today, by definition, their summits are at least 600 feet below the surface, and some are as deep as 8,200 feet. Most lie between 3,200 feet and 6,500 feet. Their tops are not really flat but slope upward to a low pinnacle at the center. Dredging from the tops of guyots has recovered basalt and coral rubble, and that would be expected from the eroded tops of what were once islands. Some of this material is over 80 million years old. Geologists think the drowning of the guyots involved two processes: The great weight of the volcanic mountains depressed the sea floor beneath them, and the level of the sea rose a number of times, especially when the last Ice Age ended, some 8,000 to 11.000 years ago.

51. What is the author's main purpose in writing this passage?

A. To trace the career of Arnold Guyot.

B. To describe feature of the undersea world.

C. To present the results of recent geologic research.

D. To discuss underwater ridges and volcano chains

52. The word “conceal” is closest in meaning to which of the following?

A. Contain                 B. Erode                                C. Hide                       D. Create

53. The passage implies that guyots were first detected by means of________.

A. a fathometer                                                        B. computer analysic

C. a deep-sea diving expedition                            D. research submarines

54. The author indicates that Arnold Guyot________.

A. was Harry Hess's instructor                              B. invented the fathometer

C. named the guyed after himself                          D. taught at Princeton University

55. What does the passage say about the Arctic Ocean?

A. The first guyot was discovered there.

B. No guyots have ever been found there.

C. There are more guyots there than in any other ocean.

D. It is impossible that guyots were ever formed there.

56. The author states that offshore canyons and guyots have which of the following characteristics in common?

A. Both are found on the ocean floor near continental shelves.

B. Both present oceanographers with a mystery.

C. Both were formed by volcanic activity.

D. Both were, at one time, above the surface of the sea.

57. According to the passage, most guyots are found at a depth of________.

A. less than 600 feet.                                                           B. between 600 and 3,200 feet.

C. between 3,200 and 6,500 feet                            D. more than 8,200 feet

51. Which of the following is closest in meaning to the word “rubble”?

A. Fragments             B. Mixture                             C. Columns               D. Core

51. According to the passage, which of the following two processes were involved in the submersion of guyots?

A. Erosion and volcanic activity.

B. The sinking of the sea floor and the rising of sea level.

C. Mountain building and the action of ocean currents

D. High tides and earthquakes

60. According to the passage, when did sea level significantly rise?

A. In 1946                                                                 B. In the nineteenth century

C. From 8,000 to 11,000 years                              D. 80 million years ago