透射电镜最高的分辨率是（）。A.0.2nm B.2.0nm C.10nm D.0.2

—Have you seen my e-mail about our TESL project? 

—Yes. Luckily I checked my e-mails yesterday. Normally I ______ my e-mail box for days. [ ]

A. haven’t opened                        

B. didn’t open

C. hadn’t opened                        

D. don’t open

与脑的生理功能关系最密切的脏腑是（）

A.心肺肝

B.心肝脾

C.肺脾肾

D.心脾肾

E.心肝肾

Colleges in the US have added a new subject, “great chemistry”, to their curriculum today. “Green chemistry (53) how we can develop products that won’t (54) the environment,” explains Paul Anastas, director of Yale University’s Center for Green Chemistry and Green Engineering, opened at the beginning of this year. The American Chemical Society, (55) approves more than 600 college chemistry programs, only lists about a dozen that teach green chemistry. But that (56) is growing.
Cambridge College in Massachusetts is offering “ an introduction to green chemistry” course this gall and is offering the nation’s first bachelor’s and master’s (57) in green chemistry. The program will have classes in environmental science and even environmental (58) and policy. These subjects are not (59) taught to chemistry major.
Employers (60) the introduction of green chemistry. Businesses are increasing seeking graduates (61) backgrounds in the subject because it can help them make or save money in he development and manufacturing of products. “We need people who can not only understand their place (62) , but also understand the worldwide perspective,” said Adam Peterson, a chemical division manager at Dow Corning Corp.

A．injure
B．distress
C．wound
D．hurt

我国民法的渊源主要是指有关机关在其职权范围内制定的有关民事的规范性文件，其中，制定法的渊源包括( )。

A．民事法律

B．法理

C．习惯

D．判例

预先核准的公司名称的保留期为多长时间？