问答题

According to the author， why are cities frightening? 查看材料

A.Because
B.
B.Because
C.
C.Because
D.
D.Because
E.

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Cooperative learning emphasizes on and collective responsibility.

A.teachers'
B.individual
C.solely
D.team

单项选择题

在爆破前，将爆破区内的液压支架、电缆等用挡帘挡牢(或给液压支架穿上裤套)，把采煤机开出爆破地点()以外，否则不许爆破。

A、20m
B、30m
C、50m