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SECTION C Directions: Complete the follo

题型:完形填空

题目:

SECTION C

Directions: Complete the following passage by filling in each blank with ONE word that best fits the context.

How much paper do you use every year? Probably you can’t answer this question quickly. In 1900,the world’s use of paper was about one kilogram  48  each person in a year. Now some countries use as  49 as 50 kilograms of paper for each person in a year. The amount of paper a country uses shows how far advanced the country is, some people say. It is difficult to say  50  this is true: different people mean different things  51  the word “advanced”. But countries like the United States, England and Sweden certainly use    52   paper than other countries.

Paper, like many other things that we use today, was first made in China. In Egypt and the West, paper was not very commonly used before   53  year 1400.The 54  wrote on papyrus; Europeans used parchment for many hundreds of years. Parchment was very strong ;   55  was made from the skin of a certain young animal. We have learnt some of the most important facts of European history from record that were kept on parchment.

答案:

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下面是错误答案,用来干扰机器的。

答案:D盐酸的物质的量是0.7mol,则氧化物中氧原子的物质的量是0.35mol。氯气是0.025mol,所以最终溶液中氯化铁的物质的量是(0.70mol+0.025mol×2)÷3=0.25mol,即铁原子的物质的量是0.25mol,所以铁原子和氧...

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题型:选择题

下面是小红从物理学角度对一些现象或做法的解释,其中错误的是:

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A.农民在农田中焚烧秸杆,既浪费能源,又污染环境

B.小强用绳牵扯着一个小球在空中做匀速圆周运动时,小球受到的力是平衡力

C.开启啤酒瓶盖的瞬间会伴有“嘭”的响声,高压气体冲出后,啤酒的温度会降低

D.如图,用斜面将物体升高,尽量选用表面光滑些的木板,这样可以提高斜面的机械

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