问题 选择题

防止金属生锈是保护金属资源的有效途径,光亮的铁钉在下面几种情况下,最不容易生锈的是

答案

答案:B

题目分析:铁在与氧气和水充分接触时容易生锈,水和氧气的同时存在是铁生锈的必要条件;如果缺少水或缺少氧气,或者缺少氧气和水,铁就不容易生锈。

A、铁钉浸没在水中,由于水中会溶有少量氧气,所以依旧会生锈,只是会慢一些,错误;

B、铁钉浸没在植物油中,与水和氧气隔绝,最不容易生锈,正确;

C、铁钉露置在空气中,空气中有一定量的水蒸气,故能与氧气和水蒸气接触,容易生锈,错误;

D、铁钉部分浸没在盛有水的试管中,与氧气和水充分接触,最容易生锈,错误。故选B

点评:铁在潮湿的空气中易生锈,实际上是铁与空气中的氧气、水蒸气等发生化学反应的过程,只要破坏铁制品锈蚀的条件,就能防锈。

阅读理解

In Japan, “what’s your type?” is much more than small talk; it can be a more important question in everything from matchmaking to getting a job. By type, the Japanese mean blood type, and no amount of scientific debunking (揭穿) can kill a widely held belief that blood tells all.

In the year that just ended, four of Japan’s top 10 best-sellers were about how blood type determines personality, according to Japan’s largest book distributor, Tohan Co. Taku Kabeya, chief editor at Bungeisha, thinks the appeal comes from having one’s self-image confirmed; readers discover the definition of their blood type and “It’s like ‘Yes, that’s me!’“

As defined by the books, type As are sensitive perfectionists but overanxious; type Bs am cheerful but weird and selfish; Os are curious, generous but stubborn; and Abs are arty but mysterious and unpredictable. All that may sound like a horoscope(占星), but the public doesn’t seem to care. Nowadays matchmaking agencies provide blood-type compatibility (兼容性) tests, and some companies make decisions about assignments based on employees’ blood types. Children at some kindergartens are divided up by blood type, and the women’s softball team that won gold at the Beijing Olympics used the theory to customize each player’s training.

Blood types, determined by the proteins in the blood, have nothing to do with personality, said Satoru Kikuchi, associate professor of psychology at Shinshu University. “It’s simply false science, “he said, “The idea encourages people to judge others by the blood types, without trying to understand them as human beings. It’s like racism.” This use of blood-typing has disreputable (名声不好的) roots. The theory was imported from Nazi race ideologues (空谈家) and adopted by Japan’s militarist government in the 1930s to breed better soldiers. The idea was abandoned years later and the craze faded. It resurfaced in the 1970s, however, as Masahiko Nomi, a supporter with no medical background, gave the theory mass appeal. His son, Toshitaka now promotes it through a private group, the Human Science ABO Center, saying it’s not intended to rank or judge people but to smooth relationships and help make the best of one’s talents.

1. That many Japan’s best-sellers were about blood type implies ____________.

A. this topic is used by many people in small talks

B. Japanese attach great importance to blood type

C. people don’t want to have confirmed self-image

D. the definition of blood type leads to arguments

2. According to the passage, ________ may face more pressure while performing a task.

A. type As   B. type Bs    C. type Os    D. type ABs

3. Kikuchi compared blood type determinism to racism because ______________.

A. both blood type and race are determined by the proteins in the blood

B. neither blood type nor race is related to our character and personality

C. both of them judge people without considering their individualities

D. blood type determinism believes human abilities are decided by race

4. Who introduced the blood type theory to Japan?

A. Nazis from Germany.                                  B. Japan’s militarist government.

C. A supporter called Masahiko Nomi.         D. Human Science ABO Center.

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