我国钾肥资源缺乏，应如何积极开发和合理利用有限的钾肥资源？

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问题问答题简答题

答案

参考答案：

1、加强钾的循环和再利用。2、积极寻求生物性钾肥资源。3、合理轮作换茬，缓和土壤供钾不足的矛盾。

阅读理解

阅读下面短文，判断句子正误。正确的写“T"，错误的写“F"。

Boy: Who's that man?

Girl: He's my father. He works in a school.

Boy: What does he do?

Girl: He's a math teacher.

Boy: How does he go to work?

Girl: He usually goes to work by bike.

( ) 1. The man is the girl's uncle.

( ) 2. He is a teacher.

( ) 3. He works in a library.

( ) 4. He teaches Chinese.

( ) 5. He goes to work by bike.

判断题

不同的用户拥有不同的角色，其权限也就不一样。