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 這篇短文介紹了水稻是世界上最重要的食物．根據(jù)調(diào)查，水稻喂養(yǎng)了世界上三分之一的人口．三千年至四千年前，中國開始種植水稻．現(xiàn)在，大米人們一日三餐的主食．水稻的收成依靠許多因素．適宜的溫度，合適的降水量，適度的肥料，還要小心昆蟲．

解答 46．答案：B．考查動詞固定搭配，help do sth．有助于做某事，結(jié)合語境可知：根據(jù)一項調(diào)查，水稻有助于養(yǎng)活全世界三分之一的人口．故選：B．
47．答案：D．考查形容詞及語境的理解，be+形容詞，作表語，be common in在…中很普遍．根據(jù)上下文可知：現(xiàn)在，人們的日常膳食中大米很常見．考查形容詞Common 主要的，故選：D．
48．答案：E．考查常識，根據(jù)語境可知：中國有世界上最多的人口．考查形容詞最高級，the largest最大，最多，故選：E．
49．答案：C．考查固定詞組depend on依靠，根據(jù)語境可知：水稻的收成依靠許多因素．故選：C．

點評 選詞完成短文，注意每詞只用一遍，故碰到不會的或拿不準(zhǔn)的，可以先空過去，將自己確定的先填完，然后從剩下的詞中，根據(jù)詞性，句意來判斷正確答案．

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