造成高度近视的主要原因是遗传因素。

如果自行车车条的长度比标准长度长2mm，记作+2mm，那么比标准长度短1.5mm，应记作（    ）mm。

一辆汽车从甲城开往乙城每小时行驶60千米，8小时到达。如果每小时行驶80千米，x小时可以到达。   

（1）已知条件里相关联的两种量是（    ）和（    ）。   

（2）根据“一辆汽车从甲城开往乙城”这句话说明汽车行驶（    ）是一定的。

（3）这两种相关联的量成（    ）比例。

（4）用等式把题目中的条件表示出来是：（    ）×（    ）=（    ）×（    ）。

手机中使用锂电池是一种新型的高性能电池，已知锂电池放电时的化学方程式：Li+MnO₂═LiMnO₂，下列有关说法错误的是（　　）

A．该反应在常温下就可发生

B．该反应实现由化学能转变为电能

C．该反应产物属于氧化物

D．反应前后Li元素的化合价发生了变化

阅读理解。

     Do you know why I am always in support of learning a foreign language? The reasons are as follows:

1. Improve your English

    I know this might not make sense at first but hear me out. As a person who speaks only one

language, you have no basis for comparison（比较）；all you know is English. In different languages

the same idea is often expressed in different ways. You will find yourself speaking and writing more

creative sentences. There is a reason why most great writers and poets are students of many

languages.2.______________

     Travelling is one of the great joys of life and also one of the most wonderful experience. Why not

get the most out of your experience? If you don't know the native language of the country that you are

visiting, you are completely excluded from the culture. The locals（当地人）don't speak to you.

Knowing even a few phrases will make a huge difference. You will meet more people and find it much

easier to get around.

3. Join the global community

     The majority of the world does not speak English. The truth is that new thoughts and ideas are

happening everywhere and they are not being immediately translated. The world is getting smaller and

we are coming into contact(接触) with more non-English speakers all the time. Gain an advantage

for yourself in business and personal relationships by being able to communicate with people in their

language.

     Now that you know three great reasons for learning a foreign language, do it right now.

1. According to the author,______.

A. it is necessary for writers and poets to learn many languages

B. knowing another language will make you able to write a novel

C. studying another language will help you make your native language better

D. if you only know one language, you have no ability to appreciate the language

2. The underlined word“excluded”in the third paragraph probably means______.

A. shut out    

B. joined in    

C. sent for    

D. put up

3. Which of the following can be used to fill in the blank in the passage?

A. Help enrich your life

B. Help you to become rich

C. Help widen your knowledge

D. Increase your travel experiences

4. What is the best title for the passage?

A. Three Great Reasons for Learning a Foreign Language

B. A Foreign Language Help You Gain Respect

C. Improve Your English by Comparison

D. Build Confidence Through Learning a Foreign Language

计算并填写表。