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问题 单项选择题

汞中毒驱汞治疗的首选药物是

A．谷胱甘肽

B．半胱氨酸

C．二巯基丁二酸钠

D．维生素E

E．维生素C

答案

参考答案：C

解析：汞在肝脏、肾脏等器官系统主要与含巯基的蛋白质和酶结合。二巯基丁二酸钠可与汞竞争与巯基结合。

改错题

We are going to take the College Entrance Exams in about sixteen days. Therefore, many students still don’t know what to balance their study, rest and physical exercises while prepared for the Exams. They usually devote too much time to go over their lessons, what results in a poor health and low efficiency of learning.

As the proverb goes, early to bed and early to rise make a man healthy, wealthy and wise. We’d better leave us enough time to rest and sleep since it enables us to learn our lessons more efficient. What’s more, a strong and healthy body is the base for our further study, future work and creative activities.

In brief, as we are preparing for the Exams, don’t forget that rest, exercise and study were equally important.
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填空题

下列命令执行后的结果是 【6】 。
STORE"GOOD BYE!"TO X
LEFT(X,2)，SUBSTR(X,6,2)+SUBSTR(X,6)，RIGHT(X,3)
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