【題目】閱讀下面材料，在空白處填入1個(gè)適當(dāng)?shù)膯卧~或括號(hào)內(nèi)單詞的正確形式。

Agricultural experts say crop diversity is important to feed the【1】(increase) population of our planet. They say having a large variety of plants also【2】(help) to protect against possible crop diseases and future crises. But many experts say the number has decreased sharply during the past century.

One of the world's 【3】(large) seed conservation projects has predicted further losses. The Millennium Seed Bank Partnership is warning that up to one hundred thousand plant species could 【4】 (permanent) disappear. The rich collection of genes【5】 decide their qualities would disappear with them.

Many experts blame climate change and loss of habitat, normal growth area, for damaging plant life. They say human【6】(activity) and poorly planned, overly heavy use of land also are responsible. Modern business farming is responsible【7】loss of farmers' traditional crop varieties. The "Green Revolution" of the twentieth century changed agriculture. Some experts say the use of modern commercial farming methods saved millions of people from【8】(starve). Farmers planted, watered, and fertilized their crops with the help of machines. They treated their fields with chemicals【9】(control) diseases and insects. Harvests grew larger and higher quality,【10】 another result was that some traditional crops were lost. Damage to the environment over the past century makes people believe that crop diversity also suffered.

【答案】

【1】increasing

【2】helps

【3】largest

【4】permanently

【5】that/which

【6】activities

【7】for

【8】starvation

【9】to control

【10】but/while/yet

【解析】

這是一篇說明文。農(nóng)作物的多樣性對(duì)養(yǎng)活地球上不斷增長(zhǎng)的人口很重要。但是有很多植物正在消失，原因是氣候變化和（這些植物）棲息地的喪失。

【1】考查現(xiàn)在分詞。句意：農(nóng)作物的多樣性對(duì)養(yǎng)活地球上不斷增長(zhǎng)的人口很重要。根據(jù)句意，這里要表達(dá)的是“增長(zhǎng)的”。increase的現(xiàn)在分詞形式increasing可以用做形容詞修飾名詞 ，意為“增加的”符合句意，故填increasing。

【2】考查時(shí)態(tài)。分析句子成分可知help在賓語從句中做謂語，主語是having a large variety of plants ，是單數(shù)，所以謂語動(dòng)詞要用單數(shù)。全文時(shí)態(tài)為一般現(xiàn)在時(shí)，所以這里也要用一般現(xiàn)在時(shí)，故填helps。

【3】考查形容詞的最高級(jí)。句意：世界上最大的種子保護(hù)項(xiàng)目之一預(yù)測(cè)將會(huì)有更多的損失。根據(jù)句意，這里要用所給形容詞的最高級(jí)，故填largest。

【4】考查副詞。所給詞用來修飾動(dòng)詞disappear, permanent為形容詞不能用于修飾動(dòng)詞，所以要用其副詞形式permanently，故填permanently。

【5】考查定語從句。分析句子成分可知為___5___ decide their qualities that/which 定語從句，先行詞為genes，為物�？崭裉幰龑�(dǎo)定語從句且在從句中做主語，先行詞為物，要用that/which來引導(dǎo)這個(gè)定語從句，故填that/which。

【6】考查名詞單復(fù)數(shù)。activity為可數(shù)名詞，本句中沒有冠詞，說明要用其復(fù)數(shù)形式，故填activities 。

【7】考查固定搭配。be responsible for 為固定搭配，意為“對(duì)……負(fù)責(zé)”，所以這里要填介詞for。

【8】考查名詞。句意：一些專家說現(xiàn)代商業(yè)農(nóng)業(yè)方法的使用使數(shù)百萬人免于饑餓�？崭裉帪榻樵~from的賓語，starve為動(dòng)詞，不能做賓語，所以用其名詞形式starvation。故填starvation。

【9】考查不定式。句意：他們用化學(xué)藥品來防治疾病和昆蟲。根據(jù)句意，(control) diseases and insects. 是treated their fields with chemicals的目的，所以用不定式表目的，填to control。

【10】考查連詞。句意：收成越來越多，質(zhì)量也越來越好，另一個(gè)結(jié)果是一些傳統(tǒng)作物消失了。根據(jù)句意，Harvests grew larger and higher quality與was that some traditional crops were lost.之間是轉(zhuǎn)折關(guān)系，一個(gè)是好處，一個(gè)是壞處，所以要用表示轉(zhuǎn)折關(guān)系的連詞連接前后兩個(gè)句子，故填 but/while/yet。

語法填空題型經(jīng)常考查動(dòng)詞的使用。在所給詞為動(dòng)詞時(shí)，考生先判斷動(dòng)詞在句中做非謂語還是謂語，如果分析句子成分后發(fā)現(xiàn)所給動(dòng)詞在從句中做謂語，要考慮動(dòng)詞的時(shí)態(tài)，語態(tài)和單復(fù)數(shù)。比如第2小題分析句子成分可知help在賓語從句中做謂語。help的主語是having a large variety of plants ，是單數(shù)，所以謂語動(dòng)詞要用單數(shù)。全文時(shí)態(tài)為一般現(xiàn)在時(shí)，所以這里也要用一般現(xiàn)在時(shí)，綜合填 helps。

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