问题 选择题

三氯生是一种抗菌剂,其结构简式如下图所示,遇含氯自来水能生成三氯甲烷。下列说法不正确的是

A.三氯生的分子式是C12H6Cl3O2

B.三氯甲烷与甲烷均无同分异构体

C.1 mol三氯生最多能与6 mol H2反应

D.1 mol三氯生最多能与7 mol NaOH反应

答案

答案:A

完形填空

What is your favorite color? Do you like yellow, orange, red?   小题1: Do you prefer grey and blue? Then you are probably quiet, shy, and you would rather follow than lead.  You tend to be a pessimist(悲观者).  At least, this is what psychologists(心理学家)tell us, and they should know, because they have been seriously studying the meaning of color preference, as well as the effect that colors have on human beings.   小题2: If you happen to love brown, you did so, as soon as you opened your eyes, or at least as soon as you could see clearly.

 小题3: A yellow room makes most people feel more cheerful and more relaxed than a dark green one; and a red dress brings warmth and cheer to the saddest winter day.

 小题4: A black bridge over the Thames River, near London, used to be the scene of more suicides(自杀者)than any other bridge in the area—until it was repainted green.  The number of suicide attempts immediately fell sharply.  Perhaps it would have fallen even more if the bridge had been done in pink or baby blue.

 小题5: It is an established fact(既成的事实)that factory workers work better, harder, and have fewer accidents when their machines are painted orange rather than black or grey.

A.On the other hand, black is depressing.

B.They tell us, among other facts, that we do not choose our favorite color as we grow up—we are born with our preference.

C.The rooms are painted in different colors as you like.

D.If you do, you must be an optimist, a leader, an active person who enjoys life, people and excitement.E. Light and bright colors make people not only happier but more active.

F. Life is like a picture or a poem, full of different colors.

G. Colors do influence our moods—there is no doubt about it.

单项选择题