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问题 选择题

甲、乙两人工作效率的比是7：5，两人合作240个零件，甲比乙多做[ ]

A．20个

B．40个    

C．50个

D．120个

答案

答案：B

题目分析：根据“甲与乙的工作效率比是7：5”知道甲的工作效率是甲乙合作的，乙甲的工作效率是甲乙合作的

，运用按比例分配列式解答即可。

解：240×（－）
=240×（－）
=240×
=40（个）；
答乙比甲少40个。
故选：B． 

单项选择题

根据社会保险法律制度的规定，累计缴费10年以上的，其领取失业保险金的期限最长为（）个月。

A.12

B.18

C.24

D.36
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单项选择题

To us it seems so natural to put up an umbrella to keep the water off when it rains, but actually the umbrella was not invented as protection against rain. Its first use was as a shade against the sun.
Nobody knows who first invented it, but the umbrella was used in very ancient times. Probably the Chinese were the first to use it in the eleventh century B. C.
We know that the umbrella was used in ancient Egypt and Babylon as a sunshade. And there was a strange thing connected with its use: it became a symbol of honor and authority. In the Far East in ancient times, the umbrella was allowed to be used only by the king or by those in high office.
In Europe, the Greeks were the first to use the umbrella as a sunshade. And the umbrella was in common use in ancient Greece. But it is believed that the first persons in Europe to use the umbrella as protection against the rain were the ancient Romans. During the Middle Ages, the use of the umbrella practically disappeared. Then it appeared again in Italy in the late sixteenth century. And again it was considered a symbol of power and authority. By 1680, the umbrella appeared in France, and later on in England.
By the 18th century the umbrella was used against rain throughout most of Europe. Umbrella did not change much in style during all this time, though they became much lighter in weight. It was not until the twentieth century that women’s umbrellas were made, in a whole variety of colors.

This passage talks mainly about

A．why the umbrella was so popular in Europe

B．when and how the umbrella was invented

C．the history and the use of umbrella

D．the development of the umbrella
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