表示起重机载荷状态的名义载荷谱系数的最大值为（）A、0.5 B、0.9 C、1.0

根据合同成立时标的物是否存在，买卖合同分为（）。

A.一般买卖合同与特种买卖合同

B.竞争买卖合同与非竞争买卖合同

C.即时买卖合同与非即时买卖合同

D.现货买卖合同与期货买卖合同

It was an exciting moment for these fans this year, _____ for the first time in years they saw their favorite singers.

A．that

B．which

C．when

D．while

D

Sadness is unpleasant, and in a society where personal happiness is prized above all else, there is little tolerance for falling in despair. Especially now we’ve got drugs for getting rid of sad feelings — whether it’s after losing a job, the break-up of a relationship or the death of a loved one. So it’s no surprise that more and more people are taking them.

But is this really such a good idea? A growing number of voices from the world of mental health research are saying it isn’t. They fear that the increasing tendency to treat normal sadness as a disease is playing fast and loose. Sadness, they argue, serves a useful purpose—and if we lose it, we lose out. Yet many psychiatrists insist not. Sadness has a nasty habit of turning into depression they warn. Even when people are sad for good reason, they should take drugs to make themselves feel better.

So who is right? Is sadness something we cannot live without or something horrible never to touch?

There are lots of ideas about why feeling sad should become part of human life. It may be a kind of self-protection, as other primates (灵长类) also show signs of sadness. A losing monkey that doesn’t show sadness after it loses a fight may be seen as continuing to challenge the winning monkey — and that could result in death.

In humans sadness has a further function: we may display sadness as a form of communication. By acting sad, we tell other community members that we need support.

Then there is the idea that creativity is connected to dark moods. There are plenty of great artists, writers and musicians who have suffered from depression or disorder. Scientists found that people with signs of depression performed better at a creative task, and negative moods make people think deeply over the unhappy experience, which allows creative processes to come to the front. There is also evidence that too much happiness can be bad for your career. A doctor found that people who scored 8 out of 10 on a happiness test were more successful in income and education than 9s or 10s. The happiest people lose their willingness to make changes to their lives that may benefit them.

53．The underlined word “this ” refers to ________.

A．taking medicine              B．falling in despair            C．losing a job            D．feeling sad

54．The author believes sadness is ________.

A．a good thing for people’s health       B．something horrible never to touch

C．a necessary function of humans’       D．always to be treated as depression

55．Some animals show their sadness in order to ________.

A．cheat their enemy               B．protect themselves 

C．comfort the loser               D．challenge the winner

56．We can infer from the last paragraph that ________.

A．people with great creativity tend to be happier   

B．unhappy experiences contribute to a greater career

C．too much happiness can be bad for your career

D．the happiest people are the most successful ones

以下叙述中正确的是( )。

A．1个字符的标准ASCII码占1个字节的存储量，其最高位二进制总为0

B．大写英文字母的ASCII码值大于小写英文字母的ASCII码值

C．同一个英文字母(如字母Ａ)的ASCII码和它在汉字系统下的全角内码是相同的

D．标准ASCII码表的每一个ASCII码都能在屏幕上显示成一个相应的字符

精神与物质，是人类生活不可或缺的两翼，此起而彼伏，相辅而相生，这也是自然界的平衡规律。物质产品极大丰裕之时，人们对文化和精神的要求恰恰也就少了。反之，民族危亡，国难当头，《黄河》之声震天响起!特大地震，轰然袭来，泪光中的诗篇和歌吟，让多少人心潮澎湃，挺起脊梁，擦干眼泪!经济萧条不振，恰恰需要给人以文化的心灵鸡汤!

这段话的中心论点是（）。

A．经济环境的坎坷与挫折，正好为文化产品提供了难得的创作素材

B．人类生活中，物质产品越丰富，精神需要恰恰会越少

C．往往在民族危亡、国难当头的时候，总会有经典文化作品产生

D．社会危难之时，人们更需要文艺作品、文化产品的安抚与激励