作出函数y=x-3的图象，并观察图象回答下列问题：（1 ）x 取

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问题解答题

作出函数y=x-3的图象，并观察图象回答下列问题：

（1 ）x 取哪些值时，y>0？

（2 ）x 取哪些值时，y<0？

答案

解：函数y=x-3的图象如图所示，由图象知，

（1）当x>3时，y>0；

（2）当x<3时，y<0。

阅读理解

阅读理解。

(A)请将对话中所缺的句子补充完整。

A: Hello! This is Tom speaking. Can I speak to Mary?

B: 1________________, Tom. How are you?

A: 2________________. Let's go to the library this afternoon, OK?

B: That's good. But, how can we get there?

A: That's easy. First come to my home by bike. Then we take the No.6 bus to the library.

There is a book show in the library. We can buy some cartoon books.

B: Great! I'll get your home at 2 o'clock.

A: See you then.

B: 3________________

(B)根据对话内容回答问题。

4. Where do they want to go?

________________________________________________

5. How do they go there?

________________________________________________

问答题简答题

1978年5月11日，《光明日报》发表了一篇什么文章推动了关于真理标准问题的大讨论？