6.(09江苏)31. 　　__ unemployment and crime are high, it can be assumed that the latter is due to the former.

A. Before　　　　　　 B. Where　　　　　 C. Unless　　　　　　 D. Until

5.(09湖南卷)34. ______ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.

A. Although 　　 B. As long as　 C. If only D. As soon as

4.(09浙江卷)8. The medicine works more effectively 　　　you drink some hot water after taking it.

A. as　　 B. until　　 C. although　　 D. if

3.(09四川卷)12. Owen wouldn’t eat anything ____________ he cooked it himself　

A. until　　 B. since　 C. unless　 D. while　

2.(09陕西卷)13. My parents don’t mind what job I do 　　　I am happy.

A. even though　　　 B. as soon as　　　　 C. as long as　　 D. as though

1.(09山东卷) 28. The little girl who got lost decided to remain _________she was and wait for her mother.　

A. where　　　　 B. what　　　　 C. how　　　　 D. who　

12．一块天然金刚石约175克拉(1克拉=200毫克),已知金刚石的密度是3.5×10³千克/米³.试求这块金刚石中有多少碳原子?每个碳原子的直径大约是多少? (保留两位有效数字)

10．已知铜的摩尔质量为63.5×10^-3kg/mol,密度为8.9×10³kg/m³,阿伏加德罗常数为6.0×10²³mol^-1。若每个铜原子提供一个自由电子，求铜导体中每立方米体积中的自由电子数？(保留两位有效数字)

9．已知汞的摩尔质量M＝200.5×10^{－3 kg/mol}，密度为ρ＝13.6×10³ kg/m³，阿伏加德罗常数N_A＝6.0×10²³ mol^－-1，求汞原子的质量、体积和直径。(保留两位有效数字)

8．A、B两分子相距较远，此时它们之间的分子力可忽略，设A固定不动，B逐渐向A 靠近，直到很难再靠近的整个过程中 (　　 　)

A.力总是对B做正功

B.B总是克服分子力做功

C.B先克服分子力做功，然后分子力对B做正功

D.分子力先对B做正功，然后B克服分子力做功