What is the passage mainly about? The word "it" in line 12 refers to which of the following?

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问题 What is the passage mainly about?
The word "it" in line 12 refers to which of the following?

选项 A、Problem.
B、Material.
C、Difficulty.
D、System.

答案B

解析这句话的意思是：最严重的问题是可用物质的广泛性及把它组成系统的困难。这里的“it”指的便是“material”。

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职称英语综合类B级

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