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听对话，回答问题。 1. What's wrong with the boy? A. He's got a cough. B. He's got a fever. C. His back hurts. 2. Who is going to the hospital? A. The boy. B. His mother. C. Both of them.
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【简答题】阅读理解 Here is a story told an American general (将军) who was a very important figure in the American army during the First World War. Everybody in the Untied States knew him and many people wished to ha...
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【单选题】工作E有四项紧前工作
A.
B.
C.
D，其持续时间分别为：A=3、B=5、C=6、D=4，其最早开始时间分别为：A=7、13=5、C=5、D=9，则工作B的自由时差为（ ）。