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4.
     A.the most    B.feed       C.depends on    D.Common    E.the largest
Rice is the most important food for people all over the world.According to a survey,rice helps (46)B one third of the world's population.Rice grows well with enough water.People grow rice on flooded land and in the rain forests of Africa.
Scientists say that China started growing rice about 3,000to 4,000years ago.Now,rice is(47)Din people's daily meals.Rice can be boiled,steamed or made into other snacks.It is also a popular food on festivals.People make New Year cakes with sticky rice (糯米) every Spring Festival.
China has(48)Epopulation in the world.In order to feed more people,Chinese
scientist Yuan Longping led the Super Rice program in 1996.Today half of China's rice plants are Yuan's Super Rice.
The harvest of rice(49)Cmany factors.Rice grows well between 18°C to 35°C.A good rainfall also makes a great harvest.Farmers need to fertilize (施肥) the rice and be careful with insects.

分析 这篇短文介绍了水稻是世界上最重要的食物.根据调查,水稻喂养了世界上三分之一的人口.三千年至四千年前,中国开始种植水稻.现在,大米人们一日三餐的主食.水稻的收成依靠许多因素.适宜的温度,合适的降水量,适度的肥料,还要小心昆虫.

解答 46.答案:B.考查动词固定搭配,help do sth.有助于做某事,结合语境可知:根据一项调查,水稻有助于养活全世界三分之一的人口.故选:B.
47.答案:D.考查形容词及语境的理解,be+形容词,作表语,be common in在…中很普遍.根据上下文可知:现在,人们的日常膳食中大米很常见.考查形容词Common 主要的,故选:D.
48.答案:E.考查常识,根据语境可知:中国有世界上最多的人口.考查形容词最高级,the largest最大,最多,故选:E.
49.答案:C.考查固定词组depend on依靠,根据语境可知:水稻的收成依靠许多因素.故选:C.

点评 选词完成短文,注意每词只用一遍,故碰到不会的或拿不准的,可以先空过去,将自己确定的先填完,然后从剩下的词中,根据词性,句意来判断正确答案.

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