问题 选择题

强电解质和弱电解质的区别在于

A.水溶液中是否存在溶质分子

B.溶液的导电性强弱

C.离子化合物还是共价化合物

D.在水中的溶解度

答案

答案:A

强电解质和弱电解质的区别在于水溶液中是否存在溶质分子,若有分子存在则为弱电解质,没有分子存在则为强电解质;

阅读理解

阅读理解

        It was Sunday yesterday. Peter went to play football with his friends. Soon he felt hot and took off

his coat. On his way home , he forgot to put it on again. This morning he fell ill and couldn't go to school.

His mother told him to stay in bed and then went to buy some medicine for him. An hour later he wouldn't

lie there, so he stood by the window. The sun was shining and the birds were singing in the trees. Soon his mother came back and said,"It's warmer outside. Go to sun yourself after you take the medicine. "

       Peter went out and sat on a step and played alone. Just then a salesman(推销员)came up to him and asked,"Is your mother at home,my little friend?"

       "Yes,sir." answered the boy. The man began to ring the doorbell , but nobody answered. He rang it

for a long time andbecame angry. "I don't think you are an honest boy. "said the salesman. "There's no one in the house.  You've played a joke on(捉弄)me!" "I don't think so,sir,"said Peter. "This house isn't ours. ".

1. Peter caught a cold _________.      

A. when he was playing football

B. when he returned home

C. after he went to bed

D. after he got up this morning

2. Peter played alone this morning because____________.      

A. he had no friends

B. his friends were all at school

C. he had nothing to do at home

D. his friends had something to do at home

3. The underlined word "sun" in the story means _________.

A. 太阳

B. 日光  

C. 晒太阳  

D. 晒干

4. The salesman came to _____________.       

A. sell something to Peter's mother

B. tell something important to Peter's mother

C. see Peter's mother

D. help Peter's mother

5. Which of the following is TRUE?      

A. Peter wanted to play a joke on the salesman.

B. Peter hoped to laugh at the salesman.

C. Peter was honest.

D. Peter's mother went out.

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