[单选题]Science is still ______ of the causes of many kinds of cancer.

正确答案 ：A

ignorant

解析：解析：ignorant可以指“无学识的，愚昧的”，还指“不知道的”；unconscious意为“失去知觉的，不省人事的；无意识的”；conscious意为“有知觉的，意识到的”；informed意为“获悉，告知”。

[单选题]Joe: We haven't got together for a long time. How about lunch next week? Nancy: I'm pretty tied up all next week. How about we plan on two weeks from today? ______. Joe: OK. Wednesday in two weeks.

正确答案 ：B

I can make it on that Wednesday

解析：解析：make it表示“能够做到，行”，符合对话语境，其他词语义不恰当。

[单选题]The passage suggests that the early shops for making tools were ______.

正确答案 ：A

not very sophisticated

解析：解析：本题的依据句是“At first，these articles were whittled with a knife，but when pioneer craftsmen set up their primitive shops most of them were fashioned on a lathe--a machine which holds an object and rotates it while it is being shaped by a tool.”在这里，A选项的not very sophisticated 意思为“并不复杂，是简单的”，对应原文中的primitive(原始的，简单的)。其他选项的内容属于无关信息。

[单选题]At the foot of the mountain ______.

正确答案 ：A

stood a village

解析：解析：当句首状语是表示地点、处所的介词短语时，要引起全部倒装。D选项的错误在于其单词后没有加s。

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