皮皮学，免费搜题
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【单选题】
听力原文：You didn't do well in the test. What's the matter? (4)A.
It was wonderful.
B.
I didn't check the answer.
C.
What did you say?
D.
I like it very much.
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皮皮学刷刷变学霸
举一反三
【单选题】What does the professor say about ancient Greeks who traveled south?
A.
They noticed an apparent change in the position of the North Star.
B.
They observed eclipses at different times of the year.
C.
They were the first to estimate the distance between heavenly bodies.
D.
They wanted to prove that the Earth was flat.
【简答题】解决移动Web友好显示的三条途径是:开发移动版本页面、使用内容转换技术、________ 。