To keep air clean, people in that city don’t ______fireworks now.

A. take off B. let off

C. turn off D. put off

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--- City air is very dirty， so it would be wise ______ you to wash your hair often.

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Who wants to carry a bulky bag to school? No children. Nobody wants one shoulder to be lower than the other, and paining（疼痛）too. In India, most of us would look at the reduction（減少）of textbooks as a way out. But in a country like America, there are always more choices. A company called goReader has created a "school bag" which is the size of a laptop computer（筆記本電腦）, weighing about 2.5 kg. The goReader has a color screen and can "hold" all the textbooks that a student may need, says a report in 'The Asian Age' newspaper.

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Have you ever wondered how and why a fall leaf changes color? We first have to understand what leaves are and what they do.

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根據(jù)材料內(nèi)容選擇最佳答案。

1.The underline word ＂chlorophyII＂ in the passage means ＂ ＂ in Chinese.

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B. water and CO2

C. CO2 and glucose

D. water and glucose

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B. Leaves turn red because sunlight and the cool nights of autumn turn glucose into a red color.

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D. During winter, there is not enough light or water for photosynthesis.

5. What’s the main meaning of this passage?

A. What’s photosynthesis?

B. How and why leaves change colors?

C. Different kinds of leaves.

D. How the seasons change.

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