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S
17 tháng 2 2022
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
1. She has come _________with an idea about our environmental project.
A. up | B. on | C. in | D. by |
2. Don’t drink that water. It’s _________.
A. contaminate | B. contamination | C. contaminated | D. contaminant |
3. The polluted water ________in the death of the fish.
A. leads | B. results | C. makes | D. affects |
4. People in Great Britain use English as their _________ language.
A. official | B. native | C. foreign | D. slang |
5. Many new houses are _________in this city every year.
A. build | B. to build | C. built | D. building |
6. _________first step is to learn about the risks in your area.
A. Some | B. The | C. A | D. An |
7. The road in front of my house was flooded _________the heavy rain.
A. because | B. however | C. due to | D. although |
8. _________foreign language do you study at school?
A. Which | B. Whose | C. Why | D. How |
9. By the time they returned, all their friends_________ badminton.
A. left | B. leave | C. has left | D. had left |
10._________ he improves his IT skills, he will not easily get a job.
A. If | B. Unless | C. When | D. How |
NH
2
AT
1
TN
1
NN
25 tháng 4 2018
The question was so difficult that no one could answer it ( such)
It was such a difficult question that no one could answer it
DN
1
BT
1
\(\Leftrightarrow3^{-m}=27.81=3^3.3^4=3^7\)
\(\Leftrightarrow-m=7\Rightarrow m=-7\)
Vậy \(m=-7\)
\(\frac{3^{-m}}{81}=27\)
\(\Leftrightarrow\left(3^{-m}\right)=27.81\)
\(\Leftrightarrow3^{-m}=3^7\)
\(\Leftrightarrow-m=-7\)
\(\Rightarrow m=7\)
Vậy m= 7