问题 单项选择题

为维持人体内电解质平衡,人在大量出汗后应及时补充的离子是()。

A.Mg2+

B.Ca2+

C.Na+

D.Fe3+

答案

参考答案:C

解析:汗液中含有部分无机盐,主要是钠盐,因此,为维持人体内电解质平衡,人在大量出汗后应及时补充钠离子。故本题选C。

完形填空

On a cold winter afternoon, Susan was walking home from a supermarket. She was feeling a little   46  , as she was carrying her shopping bags. They were   47  heavy that she decided to have a rest in the park. Then she noticed a poor man   48  in front of her. The man was holding a paper bag. He walked to a rubbish bin(箱) and started looking    49  it.

Susan suddenly felt sad. She knew this man would take all that he could get. So she went up to him and gave him some fruit. The man looked up in  50  and took what she gave him.

A big smile appeared on his face and she felt very happy. Then he said, “Wow! First someone gave me this sandwich, then the orange juice, and now some delicious   51  . This is my daughter’s lucky day. Thank you, girl.” Then he went   52  , singing a song.

Just then, Susan understood   53  the saying “Giving is getting” really meant. Everyone in the world needs help; everyone can offer help and everyone will   54  by showing kindness.

Giving sometimes doesn’t cost much,   55  it means a lot to the people who you help. The man’s happiness at that moment comes into Susan’s mind every time she has the chance to help others.

小题1:A. sad     B. tired    C. frightened

小题2:A. so B. too  C. such

小题3: A. walked     B. was walking  C. to walk

小题4:A. at B. for  C. through

小题5:A. surprise    B. surprised    C. surprising

小题6: A. food   B. drink    C. fruit

小题7:A. out     B. away C. in

小题8: A. what   B. which    C. why

小题9: A. help   B. be helping   C. be helped

小题10:A. or B. but  C. and

选择题