单词拼写（共10小题，每小题1分，满分10分）

小题1:Some metals expand when it is hot and c_____ when it is cold.

小题2:If you a____ a little salt to the soup, it will taste more delicious.

小题3:Everyone can get on well with him, because he is easy to________(接近).

小题4:They are making a _______ (调查） of the population growth of the city.

小题5:While I was doing my homework, the ______(电） went off.

小题6:Water is a _______ (液体）without color or taste.

小题7:Children should be ____(独立的）in doing things and don't always rely on their parents.

小题8:I______(集中）your mind on study, and you'll make progress.

小题9:What is the ______(平均的）rainfall for summer in your country.

小题10:Nowadays many old people don't like living d______ ,for it is very noisy.

属于二级保护药材的是（）

A.羚羊角

B.熊胆

C.龙胆

D.蝉蜕