问题 单项选择题

阅读以下文字,完成下列题。
(一)美国康奈尔大学的著名天文学家卡尔·萨根曾指出,在整个银河系中差不多有二千亿颗恒星,这些恒星中有相当一部分带有行星。在这些行星中,与地球环境近似的,估计可能多达一百万颗。既然生命能够在地球上产生和演化,那也就可能同样在这些行星上产生和演化,并发展出智慧生物。而其中必定有一部分,要比现在的人类文明更为先进。因此,这些天文学家们认为,在地球以外的别的星球上出现智慧生命,是完全可能的。
(二)但萨根却对世界各地常常报道的有人遭遇外星人的消息【 】。他认为,这些报道,都是把一些人类掌握的科技加到所谓外星人身上,所描述的外星人形象也大多是人类的变形。而在别的星球,生命进化过程千差万别,外星智慧生命的演化形态很可能与人类完全不同,其掌握的科学技术也会与人类完全两样。而且这些可能产生智慧生命的星球,离地球的距离都在几千或几万光年。因此,以为每年甚至每天都有外星人来访的说法,更是完全不现实的。
(三)萨根的看法,大致可以代表严肃的科学家们的意见。这就是说,外星智慧生命的存在,从理论上讲是完全可能的;但各种发现外星人的消息,却大都不足以为信。

根据第一段的内容,认为“在地球以外的别的星球上出现智慧的生命,是完全可能的”的理由,下列解释中不够准确的一项是( )。

A.银河系中存在众多恒星

B.相当一部分恒星带有行星

C.很多行星与地球环境近似

D.与地球环境近似就会产生智慧生命

答案

参考答案:D

解析: 原文说的是生命能够在地球上产生和演化,就“有可能”在与地球环境类似的行星上产生和演化进而产生智慧生命,D项混淆了可能性与必然性,所以不够准确。

单项选择题
单项选择题

Passage Two


Five years ago, David Smith wore an expensive suit to work every day. "I was a clothes addict," he jokes. "I used to carry a fresh suit to work with me so I could change if my clothes got wrinkled. " Today David wears casual clothes—khaki pants and sports shirt—to the office. He hardly ever wears a necktie. "I’m working harder than ever," David says, "and I need to feel comfortable. "
More and more companies are allowing their office workers to wear casual clothes to work in the United States. The change from formal to casual office wear has been gradual. In the early 1990s, many companies allowed their employees to wear casual clothes on Friday (but only on Friday). This became known as "dress-down Friday" of "casual Friday". "What started out as an extra one-day-a-week benefit for employees has really become an everyday thing. " said business consultant Maisly Jones.
Why have so many companies started allowing their employees to wear casual clothes One reason is that it’s easier for a company to attract new employees if it has a casual dress code. "A lot of young people don’t want to dress up for work, "says the owner of a software company, "so it’s hard to hire people if you have a conservative dress code. "Another reason is that people seem happier more productive when they are wearing comfortable clothes. In a study conducted by Levi Strauss and & Co. , 85 percent of employers said that they believe that casual dress improves employee morale. Only 4 percent of employers said that casual dress has a negative impact on productivity. Supporters of casual office wear also argue that a casual dress code helps them save money. "Suits are expensive, if you have to wear one every day," one person said. "For the same amount of money, you can buy a lot more casual clothes. \

David Smith wears casual clothes now, because______.

A.they make him feel at ease when working

B.he cannot afford to buy expensive clothes

C.he looks handsome in casual clothes

D.he no longer works for any company