下面关于长江沿岸地带资源开发利用的叙述，合理的是[ ] A、在上游发展内河航运业

高铁血红蛋白（分光比色法）正常还原率是（）

A.>25%

B.>55%

C.>75%

D.>95%

E.>99%

根据中文提示，完成下列句子，使句子意思完整，语法正确。每空限填一词。

1. There are __________ _________(40位农民) on the farm.

2. _________ (为什么不……) go out and have a good rest?

3. My mother often ________ _________(起床) at five in the morning.

4. Please ________ _________ ( 随便吃)) to some fish, kids.

5. How about ________ ________(去购物) with me tomorrow?

6. ________ _________(别担心). I can help you.

7. On his ________ (回家的路上), he meets his friend.

植物冠幅投影面积与绿化占地面积之比，达到（）以上时为郁闭

A、0、5

B、0．6

C、0、7

D、0、8

土壤水分有效性

简述写作学。