问题 单项选择题

在测定样品时,作空白试验的目的是()

A.考查试验中是否存在过失误差

B.找出改正数据或直接在试验中纠正可能引起的误差

C.消除由试剂、蒸馏水及器皿引入的杂质所造成的系统误差

D.作为标准曲线的一点

E.消除试验中的偶然误差

答案

参考答案:C

阅读理解

In 1961 Obama was born in Hawaii, US. His father was an African and his mother was a white American. He grew up in Indonesia and Hawaii.

When Obama was 10 years old, he was one of the only three black students at his school in Hawaii. He felt very different from most other students. White girls wanted to touch his hair. A white boy even asked him what his father was.

“I lied to them that my father was a Kenyan prince. But I kept asking myself who I am," said Obama.

However, 37 years later, the boy made history. Obama became the first black president in US history.

Obama's unusual background made him wonder who he was. He once turned to alcohol to help forget this question.

With the help of his friends, Obama finally turned his life around at college. His hard work made him a star at Harvard. Later, he became the third black senator (参议员)in US history.

"Obama's success has made Martin Luther King's dream come true. That is: A man should not be judged by the colour of his skin, but by the content of his character," wrote ABC news.

小题1:Obama was born in _______.

A.Britain

B.American

C.Kenya

D.Indonesia小题2:Which of the following is TURE according to the passage?

A.Obama's parents are both African

B.Obama was the first black senator in US history

C.Obama was once very depressed (压抑)because of his unusual background.

D.No other black students were in the school where Obama studied when he was ten.小题3:Obama became the first black president in US history when he was ______.

A.37

B.38

C.47

D.48小题4:From the passage we can learn that ______________.

A.Obama's father is a Kenyan prince.

B.Obama was a star in Harvard because he drank a lot

C.We should judge a person by what he did when he was young

D.Obama's success owes to his hard work

判断题