问题 选择题

控制变量法是实验探究的重要方法.利用如图所示的实验不能实现的探究目的是(  )

A.甲图中①②对比可探究铁的锈蚀与植物油是否有关

B.甲图中①③对比可探究铁的锈蚀与水是否有关

C.乙可探究可燃物的燃烧是否需要达到一定温度

D.乙可探究可燃物的燃烧是否需要与氧气接触

答案

A、②中植物油的作用是隔绝氧气,看铁在只和水接触的条件下能不能生锈,故不能实现的探究目的;

B、③中铁钉只和氧气接触,①中铁钉和氧气以及水同时接触,一段时间后,③中铁钉没有锈蚀,而①中铁钉锈蚀,通过①③对比说明铁钉锈蚀的条件之一是铁钉与水接触.故能实现的探究目的;

C、乙通过薄铜片上的白磷和红磷的燃烧对比可知,温度达到了白磷的着火点所以燃烧了,可探究可燃物的燃烧是否需要达到一定温度,故能实现的探究目的;

D、乙通过薄铜片上的白磷和水中的白磷的燃烧对比可知,薄铜片上的白磷与氧气接触所以燃烧了,可探究可燃物的燃烧是否需要与氧气接触,故能实现的探究目的;

故选项为:A.

阅读理解

Ted Turner, achieved high goals and great success by the time he was 43. Best known for his CNN, Ted Turner launched a second nationwide all-news network, Headline News, purchased the Atlanta Braves baseball team, and became the world's best yachtsman at the America's Cup in 1977. In 1982 Ted Turner was named by Forbes one of the 400 richest people in the US. He was named Time magazine's "Man of the Year" in 1992. How did Ted Turner accomplish all of this at such a young age?

Ted Turner's father, Ed, was a self-made millionaire who demanded that his only son try to achieve similar success. He instilled in the boy a strong belief that hard work was good. Besides reading a new book every two days, Ted Turner was also charged rent at home during summer vacations from boarding school. Ed Turner was a strong influence in his son's life.

As a child, Ted Turner lived a very lonely life, often separated from his family. He was enrolled in a military academy in the fifth grade and eventually went to Brown University. He attended college off and on, became involved in sailboat racing, and became a member of the U.S. Coast Guard. In his early twenties, Ted Turner became general manager of one of his father's branch offices in Georgia.

Two years later after his father’s suicide, Ted Turner took over the company. He soon discovered that he was more skilled than his father in managing the business. During the next twenty years, Ted Turner worked hard to accumulate enough power and money to fulfill his father's dream.

Reflecting on his father's death, however, Ted Turner realized that it was dangerous to put too much emphasis on material possessions. He decided to use his hard-earned influence to serve the public. Concerned about the environment, Ted Turner established the Better World Society in 1985. The purpose of this organization was to produce documentaries to educate people about pollution, hunger, and the danger of building weapons of mass destruction. In 1986 Turner began sponsoring the Goodwill Games to promote world peace. The Turner Tomorrow Awards were created to encourage writers and thinkers to focus their attention on solving world problems. The Turner Family Foundation was established in 1992.

小题1: What is CNN according to the passage?

A.It’s a broadcast-news company.

B.It’s a basketball team agency.

C.It’s a charity organization.

D.It’s a publishing house.小题2: What is the main idea of Paragraph 1?

A.The creation of CNN encouraged broadcasters to be more successful.

B.Towering goals and hard work led to fame and prosperity.

C.Ted Turner was expert at sailboat racing and playing basketball.

D.Ted Turner became very successful at an early age.小题3: As a student in a military academy, Turner ______.

A.wasn’t as lonely as he looked because his many friends at school.

B.missed his family very much despite having friends at school.

C.served as a member of the US Coast Guard for a while.

D.showed little interest in studying but other affairs.小题4: The author seems to believe that Ted Turner is ______.

A.slow moving

B.incompetent

C.goal-oriented

D.modest小题5: Which of the following best describes an important change in Ted Turner’s life?

A.He became more determined and was feared by this workmates.

B.He developed respect and admiration for his employees.

C.H e revised his view of the world and his responsibility in it.

D.He demanded the same level of success as he father.

单项选择题