题目内容

【题目】 美国总人口3.1亿,目前美国的务农人口仅约占总人口的2%,但是美国却拥有巨大的粮食储备,谷物的结转库存占世界第一,近年来大致接近世界库存总量的1/3;美国畜产品在世界上占有巨大的份额,常年销售量为全球第1位。

据此,完成下面小题。

1美国从事农业的人口少但产量却很高的原因是( )

A. 美国土地特别肥沃且耕牛多B. 美国农场雇佣了大量外籍工人

C. 美国光照充足、雨热同期D. 美国农业生产实现了专业化和机械化

2为美国农业生产提供了大量水源的河流是( )

A. 密西西比河B. 尼罗河

C. 科罗拉多河D. 伏尔加河

【答案】

1D

2A

【解析】

1美国从事农业的人口少但产量却很高的原因是美国农业生产实现了专业化和机械化,生产效率极高,农产品极其丰富,故选D。

2为美国农业提供大量水源的河流是美国最大的河流-密西西比河,该河纵贯美国中部,为美国农业提供大量水源及水上运输,故选A

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【题目】 March 21st is World Sleep Day. This year's slogan(口号)is “Healthy sleep, safe travel”. Its_____ is to let people know the importance of healthy sleep.

Sleep is like food for the brain, and enough sleep helps the body and brain grow and _____. According to the National Sleep Foundation in the US, adults need seven to nine hours of sleep every night. _____ students aged 10 to 17, a healthy sleep is about eight to nine hours per night.

But many students don't get enough sleep because of _____ school start time and heavy homework. About 80 percent of middle school students don't get enough sleep, the China Youth and Children Research Center reported. For some students, they want to sleep early, but they keep worrying about their schoolwork and can't_____ quickly. For others, they may even have insomnia(失眠)

These sleeping problems greatly affect people's life. Studies have shown that the lack of sleep for teenagers leads to poor _____. Students without enough_____ can't pay attention to class or do well in sports. Also, the lack of sleep may make them depressed.

_____, people should form good sleep habits. With good sleep habits, it is easier to fall asleep. Some of these good habits include _____ drinks that make people excited late at night, going to bed at the certain time each night, and sleeping in a ______ place that is dark, quiet and neither too warm nor too cold.

1A.suggestionB.goalC.influenceD.work

2A.developB.stopC.useD.change

3A.ForB.ToC.AsD.On

4A.lateB.slowC.earlyD.fast

5A.fall offB.fall asleepC.get upD.stay up

6A.mannersB.gradesC.mistakesD.tasks

7A.habitB.lifeC.waterD.sleep

8A.ThereforeB.MoreoverC.InsteadD.However

9A.allowingB.avoidingC.havingD.requiring

10A.noisyB.healthyC.cheapD.comfortable

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