单项选择题

具平末端DNA片段之间的连接反应只能用T4 DNA连接酶，并且必须增加酶的用量。（） A. 对 B. 错

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单项选择题

经纬仪在使用之前要进行检验与校正，检验与校正的内容不包括（）。

A.视准轴平行于水准管轴的检验与校正
B.照准部水准管的检校
C.十字丝竖丝的检校
D.视准轴的检校

Section B
Directions: In this section, you are going to read a passage with ten statements attached to it. Each statement contains information given in one of the paragraphs. Identify the paragraph from which the information is derived. You may choose a paragraph more than once. Each paragraph is marked with a letter. Answer the questions by marking the corresponding letter on Answer Sheet 2.

答案： (1)
I ...