GRE机经题库
>
>
六选二
>
NO.258
中等
00:00
本题平均耗时:2分10秒
|
正确率:76%
Select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.
Any antimatter in our part of the universe is necessarily _____ because of the overwhelming preponderance of ordinary matter, by which antimatter is quickly annihilated.
short-lived
nebulous
scarce
concrete
substantial
ephemeral
Select two answer choices.
做题笔记


题目讨论