试题与答案

方程x+2y=7的所有自然数解是（ ）。

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题型：填空题

题目：

方程x+2y=7的所有自然数解是 （     ）。

答案：

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考点：二元一次方程的解法
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题型：阅读理解

阅读理解

     Giving an unwanted gift you received to someone else (regifting) is not considered as unacceptable

as in the past. Many Americans begin to regift and they think that regifting is okay most of the time. But

what should you avoid when regifting?

     First of all, a gift card hidden in a gift box can easily get passed along in error. Therefore, take the

card out of the old packaging, buy a new one and take a little extra time to make the packaging look

fresh and attractive.

     Secondly, people like to believe the gifts they receive are chosen with thought and consideration. If

you tell someone that the necklace you are giving is the one your aunt gave you last year, what you are

really saying is that you are giving them something you think is ugly or useless.

     Thirdly, there is a big difference between regifting an unused gift and one that you have used just for

a short time and decided you no longer want. Remember, a regift is a new thing. A hand-me-down is an

item you've used and offer to someone else when you decide you no longer use it.

     Most importantly, avoid giving a regift to friends who originally gave the gift to you. If the regift is

given, you risk getting caught for giving it away to the person who gave it to you.

     In a word, regifting is a wonderful way to save money and when it is done with thought, we can

achieve the goal of why we are giving a gift to someone in the first place - because we want them to have

something they will enjoy.

1. You are advised to give a new packaging to a gift mainly because       .

A. Americans like something new and attractive

B. it shows that the card has never been used

C. you can avoid giving the gift receiver wrong things.

D. it shows that the gift is chosen with thought

2. The worst thing happens when you       .

A. regift a hand-me-down item        

B. regift what you don't like

C. regift something wrapped in the original packaging

D. regift to the person who gave it to you

3. The main purpose of the writer is to tell us       .

A. it's common to regift in America

B. the things we should avoid when regifting

C. regifting can cause mistakes  

D. what are the proper things to regift

4. We can conclude from the text that the key to regifting is to       .

A. do it with thought

B. pay attention to what you say

C. save as much money as possible    

D. make the regift look new and attractive
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