[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]Martin: Can you cover for me on Sunday? I'm supposed to teach the high school class. Lisa: Sure. ______ ? Martin: We're going to the beach for the weekend. Lisa: Well, don't worry. I'll take good care of Sunday school.

正确答案 ：C

What's up

解析：解析：对话中，Lisa同意帮Martin的忙，接下来Martin解释说要去海滩度周末。可见 Lisa在前面可能问他去做何事。C．What's up? 在口语中常用来表示“你怎么了?”“有什么事?”符合题意。

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