问题 选择题

下列化学实验能够成功的是

A.小明用木炭代替红磷做测定空气中氧气含量的实验

B.小颖用锌、铁、铜和稀盐酸确定锌、铁、铜三种金属的活动性

C.小聪在20℃配制36%的氯化钠溶液(20℃时氯化钠的溶解度为36 g)

D.小青将过量的木炭粉和少量氧化铜粉的混合物置于蒸发皿里加强热,得到纯净的铜

答案

 

题目分析:A选项不能成功,因为木炭燃烧不会造成明显的压强差;B选项可行,可通过是否反应证明铁锌的活动性比铜强,看产生气泡的快慢确定金属锌和铁的活动性;C选项不成功,溶质的质量分数是溶质的质量与溶液质量之比,所以配制不出20℃配制36%的氯化钠溶液;D选项不成功,铜在高温下能与氧气反应生成氧化铜,故答案选择B

阅读理解

 Lifeguard, sportscaster, movie star, governor, president——there wasn’t much Ronald Reagan didn’t do in life.

“The world was a vast opportunity for him,” Lou Cannon wrote in his biography(传记) of the former US president, who died on June 5,2004, aged 93.

Reagan’s final years saw him fight a losing battle against Alzheimer’s disease(老年痴呆症). But his positive attitude toward life has given hope to many people.

Born in 1911 to a poor family in a small town in Illinois, his father was a failed salesman who drank too much. It was in these difficult times, though, that Reagan developed the powerful optimism(乐观) that would serve him so well. He always believed better times lying ahead, and this was reflected in his high school yearbook entry. “Life is one grand, sweet song, so start the music,” he wrote.

As a teenager, Reagan spent summers working as a lifeguard at a local beach, saving 77 lives in seven years. He graduated from college in 1932 with a degree in economics and sociology. But America was still in the middle of the Great Depression, and jobs were hard to find. Reagan finally found work as a radio sports announcer and this road led him to Hollywood in 1937.

During the 20---year film career, he never became a leading star. As in his lifeguard days, Reagan loved to play the hero and only took the role of a bad guy once in more than 50 films.

A talented speaker who was always able to connect with his audience, Reagan became involved in politics in the 1950s. This popular touch led to him being elected the governor of California in 1967.

All the while Reagan was in California, he had his eye on the White House. In 1980, aged 69, he became the oldest man ever elected president.

He held office from 1981 to 1989, the first president to serve two complete terms after World War Ⅱ. When he left, aged 77, he held the highest popularity rate of any retiring president in US history.

He remained positive even when he discovered he had an illness that would destroy him. “I will leave with the greatest love for this country of ours and eternal(永恒的optimism(乐观) for its future,”he wrote.

小题1:Reagan can be best described as a man with ______.

A.firmness

B.humour

C.optimism

D.talent小题2:What didn’t Reagan do in his life time?

A.Playing the role of a bad guy.

B.Being a leading star of the film.

C.Saving people’s lives.

D.Working as a radio sports announcer.小题3:Which is the correct order of events described in the passage?

a. Reagan fought a losing battle against Alzheimer’s disease.

b. Reagan became an actor.

c. Reagan worked as a lifeguard.

d. Reagan graduated from college.

e. Reagan was elected the governor of California.

A.a, c, d, e ,b

B.e, c, d, b, a

C.b, a, c, d, e

D.c, d, b, e, a小题4:When the writer of Reagan’s biography says “The world was a vast opportunity for him,” he really means that _______.

A.Reagan achieved much in his whole life

B.Reagan could have done much better

C.Reagan did much for America and the world

D.Reagan was a very lucky man

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