19.As the population grows and temperatures rise,(61)it will become more ifficult to grow enough food for everyone.(62)Luckily (luck),scientists are now exploring the planet for plants that do not need as much water as today's crops.The Mojave Desert in the U.S is home (63)tosome of these plants.
Scientist Heather Rose Kates of the University of Florida is in that desert.She is not collecting the coyote melon(瓜),which she descries as terrible.
Coyote melon may not taste good,but it can (64)be grown (grow) in places that have little rainfall by farmers.The desert (65)where it grows gets just 15to 20centimeters of rain per year,or less.Other kinds of melons need at (66)least (little )two and a half centimeters per week to grow.
Now scientists(67)are considering (consider) combining coyote melon with other melons to see if they can make a tasty vegetle that doesn't need as much water to grow.That could be useful on a planet (68)becoming (become) warmer and more crowded every day.
Rose Kates says farmers will need (69)to produce (produce) 50to 70percent more food by 2050to feed the world.So,he says,(70)researchers ( research)are studying the wild versions of farm-grown crops.

分析 隨著人口增加和氣溫升高,社會對食物的需求量將越來越大,傳統(tǒng)的種植方式已經(jīng)不能滿足,一些科學家開始研究一種新型的種植方式,并取得了一定的成效.

解答 61.it; 考查人稱代詞.從結(jié)構(gòu)可知句子主語是不定式短語,it作形式主語填it.
62.Luckily;考查副詞.修飾整個句子應該用副詞形式,位于句首,首字母要大寫,填.Luckily.
63.to;固定短語:be home to"…的家、故鄉(xiāng)、棲息地",填to.
64.be grown;考查被動語態(tài).根據(jù)句意可知是被動關(guān)系,含有情態(tài)動詞的被動形式為:情態(tài)動詞+be+done,故填be grown.
65.where;考查定語從句.定語從句是主謂結(jié)構(gòu),缺少關(guān)系副詞,先行詞為地點名詞,故填where.
66.least;考查形容詞.固定短語:at least"至少",填least.
67.a(chǎn)re considering;考查動詞時態(tài).根據(jù) now 判斷用現(xiàn)在進行時,表示目前科學家們正在做的事情,填 are considering.
68.becoming;考查非謂語動詞.從結(jié)構(gòu)判斷此處是非謂語動詞短語作定語,become 和被修飾名詞 planet 之 間存在主動關(guān)系,用現(xiàn)在分詞,填 becoming.
69.to produce;考查非謂語動詞.固定搭配:need to do sth"需要做某事",填 to produce.
70.researchers;考查名詞.根據(jù)主謂一致的原則可知此處是復數(shù)名詞,填 researchers.

點評 短文改錯時首先要通讀全文,了解文章基本大意,然后細讀短文,分析句子結(jié)構(gòu)和句群關(guān)系,運用所掌握的詞匯,語法,固定搭配等基礎知識找出文中錯誤并加以修改.

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