题目内容：
The chief concern ___ foggy winter is that the lower temperaters and the absence of sunlight would severelydisrupt food production. A.on
B.over
C.of
D.for
参考答案：
选择题：The chief concern ___ foggy winter is that the low
- 题目分类：河南城建学院-大学英语2
- 题目类型：选择题
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A.on
B.over
C.of
D.for