问题
单项选择题
When visibility is about 1 nautical mile only, we say that visibility is（）.
A.very
B.good
C.moderate
D.poor
答案
参考答案：D
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When visibility is about 1 nautical mile only, we say that visibility is（）.
A.very
B.good
C.moderate
D.poor
参考答案：D