When is it cheaper to make an international call？
A. l0 a.m.
B. 5 p.m.
C. 11 p.m.
D. 8 a.m.
查看答案
What can you do if the international line is engaged？
Ask the operator to call you back later.
B. Make a "person-to-person" call.
Call back outside office hours.
D. Wait and call again when the line is free.
生物生活的具体场所称为生境，又称栖息地。
A. 正确
B. 错误
【B16】
A. when
B. before
C. after
D. while
【B19】
A. But
B. And
C. So
D. If
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