专业技术人员

1. field A. picture        B. exercise         C. child      D. machine

2. breath A. smooth         B. thousand         C. southern     D. worthy

3. breakA. bread           B. meat            C. great       D. meant

4. floors A. yours          B. baskets         C. desks      D. coughs

5. stone A. oppose        B. piano            C. soft       D. comfort

The MP3 _____ too much. He ____ 200 yuan _____ it. [ ]

A. spent, spent, on

B. cost, spent, on

C. paid, paid, for

D. paid, cost, in

We _____ have 100 yuan.          [ ]

A. every        

B. each          

C. each other    

D. any

海脊与海隆二者有什么区别？

无色～浅黄色系列钻石在（）nm处有一条特征性的吸收线。

A.415.5

B.453

C.504

D.594