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题目内容
（国家开放大学理工英语）
This article deals with the natural phenomenon which _______ most interesting to everyone.
单选题 (10 分) 10分
A.
are
B.
is
C.
they are
单选题 (10 分) 10分
A.
are
B.
is
C.
they are
参考答案
