火眼金睛，辨字组词。 祖（ ）阻（ ） 谜（ ）迷（ ） 研（ ）形（ ） 转（ ）

简述雅尔塔会议的内容及影响。

阅读理解。

     Barack Hussein Obama has made history by becoming the first African-American president in American

history.

     Barack Obama was born in Hawaii on August 4, 1961. His parents separated when he was two years old

and later divorced (离婚). Obama grew up with his mother in Hawaii, and for a few years in Indonesia. Later,

he moved to New York, where he graduated (毕业) from Columbia University in 1983. Obama met his wife,

Michelle Robinson, in June 1989 and married her on October 3, 1992. The couple's first daughter, Malia Ann,

was born in 1998, followed by a second daughter, Natasha ("Sasha"), in 2001.

     Obama's success is a true milestone (里程碑). It tells of a fact that in America you really do get a chance

to do anything if you have the talent and ability and you work hard enough.

     Obama didn't take office until 20 January, 2009. As a president, he has to face many serious challenges,

including two foreign wars, climate change and what he has described as "the worst financial crisis in a

century". But Obama himself is busy dealing with these challenges.

1. How old was Barack Obama when he became American president?

A. 48

B. 40

C. 37

D. 31.

2. Obama's success tells us that _____.

A. anyone can become president if he works hard

B. black people can achieve anything if they have talent

C. everyone can succeed if he is lucky enough

D. a talented person can succeed if he works hard enough

3. What does the underlined phrase "make history" in the first paragraph mean?

A. 编造历史

B. 创造历史

C. 杜撰历史

D. 改造历史

4. According to the passage, Obama has to face the following challenges except _____.

A. climate change

B. financial crisis

C. population problem

D. foreign wars

5. The whole passage is mainly about Obama's _____.

A. success

B. family

C. education

D. experience

如图是“制作洋葱鳞片叶表皮细胞临时装片”的部分操作示意图，请回答：

（1）用字母和箭头写出正确的操作顺序______．

（2）B中滴的是______，目的是______．

（3）简述操作A时的方法和目的？

（4）如果在D过程中滴的水太多，材料和盖玻片容易浮动，应如何处理？

肉桂具有的功效是：（）

A.温通经脉

B.回阳救逆

C.温肺化饮

D.疏肝下气

E.温中降逆

螺纹连接时用止动垫片防松属于（）

A、增大摩擦力

B、使用机械结构

C、冲边

D、粘接