题目内容

请选择（15）处的最佳答案

A. going
B. lasting
C. going on
D. taking on

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请选择（13）处的最佳答案

A. may
B. might
C. must
D. could

We have never seen such gorgeous hills.

According to IPCC, what can make up the shortfall of the oil and gas reserves？

根据材料，回答 36～40 题。
第 36 题 Why does the author mention "pyramid builders"？