[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]What should you do ff your child is under six years old?

正确答案 ：D

You should ask the doctor for advice.

解析：解析：本题的依据句为“For children under six years old consult your doctor.” consult your doctor=ask your doctor for advice，与D选项意思一致。其他选项内容属于错误信息。

[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。

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