题目内容：
The survival of civilization as we know it is _____ threat.(A) within (C) towards
(B) under (D) upon
参考答案：
选择题：The survival of civilization as we know it is ____
- 题目分类：语言/文学
- 题目类型：选择题
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The students was just about to _____ the questions
The students was just about to _____ the questions
When there are small children around, it is necess
When there are small children around, it is necess
A love marriage, however, does not necessarily ___
A love marriage, however, does not necessarily ___
Before the first non－stop flight made in 1949
Before the first non－stop flight made in 1949
Young adults ________ older people are more likely
Young adults ________ older people are more likely