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Trong tự nhiên kali có 2 đồng vị : 39 K chiếm 93,3% , 41 K chiếm 6,7% . NGUYÊN TỬ KHỐI TRUNG BÌNH CỦA KALI LÀ :

A.   39,5         B.    40,5          C.    39,0      D.39,134

IV. Identify a mistake in each sentence and correct it.

1.        In my family, children has to get permission before leaving the dining table.

2.        When I came, the whole family is having dinner around a big dining table.

3.        Lang Lieu couldn’t buy any special food while he was very poor.

4.        When you visit a temple in Thailand, you have to following some important customs.

5.        People should to lower their voice inside the temple.

I. Identify a mistake in each sentence and correct it.

1.        In my family, children has to get permission before leaving the dining table.

2.        When I came, the whole family is having dinner around a big dining table.

3.        Lang Lieu couldn’t buy any special food while he was very poor.

4.        When you visit a temple in Thailand, you have to following some important customs.

5.        People should to lower their voice inside the temple.

                                         HEALTH AND FITNESS

               advice          unfit            change           on a diet        balanced

               slim              a little          healthy           too much       keep fit

Do you feel good? Are you fit and (1)                          ? Maybe you think you are overweight and need to go (2)                             . Or maybe you are a little (3)                                    and need to put on weight. Here is some (4)                                    for you. Firstly, it is important not to do things that are bad for you - so, do not eat (5)                                 or go to bed too late. If you have an unhealthy lifestyle, try to (6)                                   some of the thinhs you do - only do the thinhs that are good for you. Make sure you eat a (7)                                   diet, including a lot of fresh fruit and vegetables. Do plenty of exercise to (8)                               : go running in the morning, or join your local gym. If you are very (9)                                      , though, you should start with just (10)                                          swimming.