阅读理解。
We are learning English, but how can we learn English well? A student can know a lot about English, but
maybe we can't speak English.
If you want to know how to swim, you must get into the river. And if you want to be a football player,
you must play football.
So, you see, you can learn by using it, You should listen to your teacher in class. You should speak English
to your classmates every day and also you could write something in English. Then one day you may find your
English very good.
1.You know a lot about English, but maybe ______ it.
A. you can speak
B. you can study
C. you can't speak
2. You must get into the river ________.
A.to learn how to swim
B.to play
C.to jump
3. Do you want to be a football player? Please _______.
A. buy a football
B. play football
C. have some lessons
4. You can learn by using it. For example:_______.
A. listen to your teacher in class
B. Speak English to your classmates every day
C. A and B
5. Which do you think is the best title for this article?
A. How to swim
B. How to play football
C. How can we learn English well
2B(g)。在三种不同条件下进行实验，A的物质的量随时间的变化如下图所示。试回答下列问题： 
