淘宝推荐使用免费的雅虎邮箱和网易邮箱。

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问题:

淘宝推荐使用免费的雅虎邮箱和网易邮箱。

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鸭27只,鸡9只。鸭的只数是鸡的几倍?

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大黄止血的成分是()

A.番泻苷A

B.没食子酸

C.结合型蒽苷

D.大黄素

E.小檗碱

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Directions: There are 4 passages in this part. Each of the passages is followed by 5 questions or unfinished statements. For each of them there are 4 choices marked A, B, C and D.
Passage One

There are two types of people in the world. Although they have equal degree of health and wealth and other comforts of life, one becomes happy and the other becomes unhappy. This arises from the different ways in which they consider things, persons, events and the resulting effects upon their minds.
People who are to be happy fix their attention on the convenience of things: the pleasant parts of conversation, the well prepared dishes, the goodness of the wine and the fine weather. They enjoy all the cheerful things. Those who are to be unhappy think and speak only of the opposite things. Therefore, they are continually dissatisfied. By their remarks, they sour the pleasure of society, hurt many people, and make themselves disagreeable everywhere. If this turn of mind was founded in nature, such unhappy persons would be the more to be pitied. The intention of criticizing (批评) and being disliked is perhaps taken up by imitation (模仿). It grows into a habit, unknown to its possessors. The habit may be p, but it may be cured when those who have it realize its bad effects on their interests and tastes. I hope this little warning may be of service to them, and help them change this habit.
Although in fact it is chiefly an act of the imagination, it has serious results in life since it brings on deep sorrow and bad luck. Those people offend many others; nobody loves them, and no one treats them with more than the most common politeness and respect. This frequently puts them in bad temper and draws them into arguments. If they aim at getting some advantages in social position or fortune, nobody wishes them success. Nor will anyone start a step or speak a word to favor their hopes. If they bring on themselves public objections, no one will defend or excuse them, and many will join to criticize their wrongdoings. These people should change this bad habit and be pleased with what is pleasing, without worrying needlessly about themselves and others. If they do not, it will be good for others to avoid any contact (接触) with them. Otherwise, it can be disagreeable and sometimes very inconvenient, especially when one becomes mixed up in their quarrels.

In this passage, the writer mainly ______.

A.describes two types of people

B.laughs at the unhappy people

C.suggests the unhappy people should get rid of the habits of unhappiness

D.tells people how to be happy in life

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重视概念的教学有助于学生()的建立和迁移能力的增强。

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生产矿井的采区回采率,薄煤层不低于(),中厚煤层不低于(),厚煤层不低于()。

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