题目内容
Small children like to eat snow. Sometimes they make snow cones (圆锥状的东西) . But eating snow can be dangerous. The snow may be full of lead (铅) .
The air in cities has a lot of lead in it. Country air may have less. Most of the lead comes from cars. Snow falls and it soaks (吸收) up the lead from the air. More lead is trapped in the snow on the ground.
Even a little lead in the body can be dangerous. Lead can harm the brain. The body gets rid of lead very slowly, so bits of lead can build up.
Children often lick (舔) icicles (冰柱) hanging from a roof . That is even more dangerous than eating snow. The water in icicles runs off the roof and picks up lead. The lead builds up as the icicles grow longer.
1.What is the main idea of this story?
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2.Which of these is the best title for this selection?
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3.The story says that snow may be full of ________.
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4.Most of the lead in the air comes from ________.
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5.Children should not lick icicles because ________.
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提示:
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1.get rid of 排除 2.build up 存积 |