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

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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