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

admin2012-12-22 69

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”。

转载请注明原文地址:https://kaotiyun.com/show/KeFd777K

职称英语综合类B级

相关试题推荐

随机试题

最新回复(0)