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问题 单项选择题

双代号早时标网络图中箭线末端对应的时标值为( )。

A．紧后工作最早开始时间

B．该工作的最早完成时间

C．紧后工作最迟开始时间

D．该工作的最早开始时间

答案

参考答案：A

阅读理解

阅读短文，完成练习。

Dear Sarah,　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　June 6th

      I feel sad. I'm going back to Canada next month. I will leave China and all my friends. We'll have a

farewell party next Saturday. I am excited. My friends are going to bring gifts. I will give them my gifts.

Mike likes collecting stamps. I will give him some stamps about Beijing Olympic Games (北京奥运会).

Zhang Peng likes playing the piano. I will give him a CD. Amy likes flying kites. I will give her a very

beautiful kite. Chen Jie likes reading books. I will give her a book. I hope they can like them. I don't want

to say goodbye to my friends.

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Ann

补全句子。

1. Mike likes ____________ ____________.

2. Zhang Peng likes ____________ ____________ ____________.

3. Chen Jie likes ____________ ____________.

4. Amy likes ____________ ____________.

判断正(T)误(F)。

( ) 5. Sarah is going back to Canada.

( ) 6. They will have a party next Saturday.

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选择题

上海世博会期间对大量盆栽鲜花使用了S-诱抗素制剂，以保持鲜花的盛开。S-诱抗素的化学式为

C15H20O4，下列关于S-诱抗素的叙述中不正确的是[ ]

A．S-诱抗素由三种元素组成

B．S-诱抗素中氢元素的质量分数最大

C．S-诱抗素中碳、氢、氧三种元素的质量比为45︰5︰16

D．S-诱抗素中碳、氢、氧元素的原子个数比为15︰20︰4

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