题目内容

蛋白质一级结构与功能的关系的特点是()。

A. 相同氨基酸组成的蛋白质,其功能相同
B. 一级结构中任何一个氨基酸的改变,其生物活性即消失
C. 一级结构越相近的蛋白质,其功能类似性越大
D. 不同生物来源的同种蛋白质,其一级结构相同

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【B8】

A. uncommon
B. likes
C. difference
D. common

设在10件产品中有4件一等品,6件二等品,现从中随机取出2件,已知其中至少有1件是一等品,则2件都是一等品的概率为().

A. 2/15
B. 1/15
C. 1/5
D. 2/5
E. 3/5

What must the woman do to know the way of making money?

A. Send a postal for five pence and an envelope with a stamp and her address.
B. Continue to read the latter half of the advertisement.
C. Send some money.
D. Buy some envelopes.

Which of the following is NOT true?

A. The prices of many things have gone up in the last month.
B. The woman pays twenty dollars for the ticket.
C. The prices of the ticket have changed by two dollars.

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