试题与答案

可燃冰的化学式为CH4•nH2O.下列关于“可燃冰”的叙述中,错误的是( ) A

题型:选择题

题目:

可燃冰的化学式为CH4•nH2O.下列关于“可燃冰”的叙述中,错误的是(  )

A.“可燃冰”不是冰,是化合物

B.因其外观象冰一样而且遇火即可燃烧,所以又被称作“可燃冰

C.“可燃冰”是混合物

D.“可燃冰”有可能成为人类未来的重要能源

答案:

A、可燃冰”不是冰,是化合物,冰是固态的水.故A叙述正确;

B、可燃冰因其外观象冰一样而且遇火即可燃烧,所以又被称作“可燃冰.故B叙述正确;

C、可燃冰”是由不同种元素组成的纯净物,属于化合物.故C叙述不正确;

D、“可燃冰”有可燃性,燃烧时能放出大量的热,有可能成为人类未来的重要能源.故D叙述正确.

故选C.

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题型:单项选择题

Etiquette(礼节) is important at a Chinese dinner party. Usually, the host(主人) should politely ask the guests to be seated first before he sits down. If there is a speech, people stop eating and drinking to listen. Every time a dish is brought out, the host asks the guests to try it first. Guests would not start eating the dish until the host asks them to. While eating, people should stop often to talk for a while. Eating all the time without stopping is not polite, and could be laughed at. Usually, people do not finish a dish. A finished dish would suggest that there is not enough of the dish to eat, which may make the host embarrassed( 不好意思的), so people would not usually pick up the last piece off a plate. During a meal, the host asks the guests again and again to eat and drink more. Without this, some people may feel embarrassed about how much they eat. From time to time, people pick up food to give it to those sitting beside them. The host keeps the guests company all the way through the dinner. He would not finish until all the guests do so.

Etiquette at a Chinese dinner party in China is the same as that in western countries.
[A] Right.[B] Wrong. [C] Doesn’t Say.

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