单项选择题

时标网络计划应以波形线表示( )。

A.工作
B.虚工作
C.工作的自由时差
D.工作的总时差
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听力原文：M: I have studied French for nearly two months. But it is still hard for me to talk with my French friends.W: You see, usually it is hard to start out and it is a long way to master a foreign languagE.Q: What does the woman mean?(18)A.French is easy to learn.B.The man should give up.C.The man should continue with his study.D.The man should talk with his French friends often.
A.French
B.
B.The
C.
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D.
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E.
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听力原文：W: We have been working on this paper for several hours and I feel really tireD.M: Why don't we just stop and breathe some fresh air outdoors? We have plenty of time to finish it tomorrow.Q: What does the man mean?(19)A.The woman should finish her paper first.B.They should not stop working on the paper.C.He'd like to postpone working on the paper. ,D.It won't take long to finish the paper tomorrow.
A.The
B.
B.They
C.
C.He'd
D.It
E.
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