题干

今年“世界水日”的宣传主题是“水与能源”.以下对水的利用过程中,主要发生了化学变化的是(   )

A:水作溶剂

B:电解水获得氢气

C:水力发电

D:水作冷却剂

上一题 下一题 0.0难度 选择题 更新时间:2019-06-29 10:15:03

答案(点此获取答案解析)

B

同类题2

任务型阅读

    People in the United States have many ways to get news, some of which are available 24 hours a day. In a recent survey(调查), about 15 percent of American interviewees said that they spend less than one-half to two hours per day watching, listening to, or reading the news. News comes from every source, not only from printed ways, but from TV, radio, and the Internet as well.

    With the increased availability of news, serious questions have been raised about the role of the news media in society. Should the media report every detail about every story, even when the information does not seem timely or valuable? Some researchers are concerned that by focusing on everything at once, the media increasingly ignore the more important social, political and economic problems that we face. We cannot concentrate on what's important by reading about what is not. One extreme example of this is the type of information covered by the tabloid(小报)media, which focus on negative stories of violence and crime.

    How can people deal with all the news that is available to them? Some become “news resisters” and choose to turn their backs on news, resisting their desire to turn on the TV and read the paper every day. They argue that although daily news reports may provide us with many facts, they do not include the background or some information that we need to understand news events. They suggest that, instead of daily reports, we look for information that has more in-depth analysis of the news, such as monthly magazines.

同类题4

   A 10-year-old boy decided to learn judo though he had lost his left arm in a car accident. The boy was doing well, so he couldn't understand why, after three months of training, the master had taught him only one move.
   “ Master,” the boy finally asked, “shouldn't I be learning more moves?"“ This is the only move you know, but this is the only move you'll ever need to know,” the teacher answered.
   Several months later, the teacher took the boy to his first competition. Surprising himself, the boy easily won his first two matches. The third match proved to be more difficult, but after some time, his opponent (对手) became impatient and charged; the boy skillfully used his one move to win the match. Still amazed by his success, the boy was now in the final.
  This time, his opponent was bigger, stronger, and more experienced. Soon after the match started, the boy seemed to lose. Thinking that the boy might get hurt, the judge called a time-out. He was going to stop the match when the teacher appeared. “ No,” the teacher said, “Let him continue.” A short time after the match carried on, his opponent made a careless mistake. At once, the boy used his move to pin (压住) him. The boy won the match and the competition.
  On the way home, the boy asked the teacher what was really in his mind. " Why could I win the competition with only one move?" The teacher answered. "First, you've mastered one of the most difficult throws in judo. Second, your opponent can only attack your left arm to win you.”
根据短文内容完成下面的表格,每空一词。

Title: One’s weakness can become his____ 
A boy had lost left arm, ____  he decided to learn judo
After three months of training, the master taught him only one move.
His first____ First three matchesHe won.
FinalHis opponent was bigger, ____  and more ____ .
At the ____ , the boy seemed to lose the match.
The judge was____  that the boy might get hurt and called a time-out.
His opponent made a mistake. The boy used his move and pinned him.
He became the ____  of the match.
____ 1. He had almost mastered one of the most difficult throws in all of judo.
 The opponent can win the match by ____  your left arm.