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问题 单项选择题

土壤溶液中的阳离子与土壤胶体表面扩散层的阳离子进行离子交换而使离子态养分保存在土壤中的吸附作用叫（）

A.机械吸收

B.物理吸收

C.化学吸收

D.离子交换吸收

答案

参考答案：D

完形填空

George Dawson wrote a book called Life Is So Good. The book is filled with stories from George's life.小题1:    It is surprising that George learned to read just two years before he wrote the book. When George was 8, his dad sent him to work.   小题2:   George did many jobs. All the time, he took care to keep it a secret that he couldn't read signs.   小题3:  

George helped his children with their homework when they were at school. They read their homework to him. He said this would help them learn better. 小题4:   He told them his secret when they started high school. Then they helped keep the secret. When George was 98, he heard about the evening classes near his home. He still had a dream that he would learn to read.    小题5:  He said, “A wise man can change, but a fool stays the same.” With the teacher's help, he wrote his book Life Is So Good two years later.

A．Because food became more important than school at that time.

B．George wrote it in 1998 when he was 100 years old.

C．He went to class and learned the alphabet(字母) in less than two days.

D．He had to ask people things and tried to remember them.E. The book is so meaningful to both the writers and the readers

F. They didn't know their dad couldn't read.
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单项选择题

梁的正载面破坏形式与纵向受力钢筋的用量、混凝土强度等级、梁的截面形式等有关，影响最大的是（）。

A.纵向受力钢筋的用量

B.混凝土强度等级

C.梁的截面形式

D.箍筋的用量
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