将人红细胞置于盛有下列液体的离心管中。10分钟后离心，得到沉淀

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问题选择题

将人红细胞置于盛有下列液体的离心管中。10分钟后离心，得到沉淀物和上清液，则上清液中K⁺含量最高的离心管内盛有[ ]

A．10%氯化钠溶液

B．0.9%氯化钠溶液

C．20%蔗糖溶液

D．蒸馏水

答案

答案：D

阅读理解

Lily is from New York , the U.S.A. She is twelve. She is in Shanghai NO.3 Junior High School. She

is in Class Eight, Grade One. Her phone number is 66786019. Dongdong is from Kunming. His English

name is Tom. He is eleven .He is in Class Seven,Grade One. His telephone number is 24524233. They

are not in the same class. They are good friends

阅读短文，选择正确的答案。

1. Lily is from _____ .

A. English

B. China

C. the U.S.A

2. Dongdong is in Class ______ .

A. Six

B. Seven

C. Eight

3. Lily and Dongdong are good_________.

A. students

B. friends

C. teachers

4. Where is Tom from ? He is from________

A. The U.S.A

B. Japan

C. China

5. How old is Lily ? She is ________

A. ten

B. eleven

C. twelve

单项选择题 A1/A2型题

十二指肠的叙述，正确的是（）

A.有肠系膜

B.环绕胰尾

C.不属于上消化道

D.是小肠中最固定的部分

E.上部位于胃体和胰体之间