问题
单项选择题
在常用的氮肥中，碳酸氢铵的含氮量为（）
A.17%左右
B.20%--21%
C.33%--34%
D.46%
答案
参考答案：A
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在常用的氮肥中，碳酸氢铵的含氮量为（）
A.17%左右
B.20%--21%
C.33%--34%
D.46%
参考答案：A
Do you know 21 languages there are in the world? There are about 1500, but many of them aren’t very 22 . English is one of the most important languages because many people 23 it, not only in England and America, 24 in other countries of world. About 375000000 people speak it 25 their own language, and another 375000000 use it as 26 language. It is 27 to say how many people are learning it. 28 boys and girls in schools are trying to do so. Many English children study French. French is also a very important language. 29 children study German, Russian, Japanese and Chinese. What is the best 30 to learn a language? We know that we all learnt 31 language well when we were 32 . If we learn a second language in the 33 way, it won’t seem so difficult. What does a small child do? It 34 what people say, and it tries to guess what it hears. When it wants something, it has to 35 it. It is using the language, 36 in it and talking in it all the time. If people use a second language 37 , they will learn it 38 . In school, you learn to read, to write, to hear and to speak. It is best to learn all new words through the 39 .You can read them, spell them and 40 them later.
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