16.Researchers find that (61)alarge amount of African dust can blow all the way across the Atlantic Ocean and fall on North and South Americas.
African dust storms can harm air quality (62)acrossthe ocean.But new research by scientists from some countries (63)shows(show)the storms also can do some good.(64)Itis found that an average of 28million metric tons of Saharan dust falls in South America's Amazon River basin each year.Scientists say the dust is an important(65)provider(provide) of fertilizer."Yes,it's(66)surprising(surprise) because of the huge amount of dust and phosphorous(磷),(67)whichis a nutrient that plants need (68)to grow(grow),"one of them says.
In fact,the phosphorous (69)falling(fall) from the sky is about the same as the amount that rivers carry out each year.The thick rainforest and the desert dust (70)are joined(join) together on one small planet.

分析 研究發(fā)現(xiàn)大量的非洲沙塵能吹過大西洋到北美和南美降落.非洲的沙塵暴會損害大洋彼岸的空氣質(zhì)量,但是新的研究表明暴雨也會帶來一些好處.據(jù)發(fā)現(xiàn)平均每年有28million 立方的撒哈拉沙塵降落在南美的亞馬遜河流域.科學(xué)家認(rèn)為沙塵是植物養(yǎng)分的重要供應(yīng)者,因?yàn)樯硥m中含有的磷是植物生長所需要的.事實(shí)上,每年空中落下的磷和河水帶走的磷的數(shù)量基本平衡.濃密的熱帶雨林和沙塵在這個星球上是聯(lián)系在一起的.

解答 61.a(chǎn);考查冠詞,a large amount of 是固定短語,意為"大量的",后接不可數(shù)名詞.
62.a(chǎn)cross;考查介詞,這里介詞短語  across the ocean作后置定語,修飾名詞 air quality.
63.shows;考查動詞,這里講述一種事實(shí)情況,用一般現(xiàn)在時,主語 new research 為單數(shù)形式,所以用第三人稱單數(shù)形式shows.      
64.It;考查固定句型,It is found that…是固定句型結(jié)構(gòu),意為"據(jù)發(fā)現(xiàn)…".        
65.provider;考查名詞,前面有不定冠詞an,所以這里要用可數(shù)名詞的單數(shù)形式,an important provider意為"一個重要的供應(yīng)者".
66.surprising;考查分詞做形容詞,現(xiàn)在分詞作形容詞修飾物,過去分詞作形容詞修飾人,這里句子的主語是it,所以用現(xiàn)在分詞作形容詞.     
67.which;考查關(guān)系代詞,分析句子結(jié)構(gòu)可知這是一個非限制性定語從句,先行詞為 phosphorous(磷),所以關(guān)系代詞用which.  
68.to grow;考查動詞不定式,這里用不定式表示目的,句意為"這是植物生長所需要的營養(yǎng)".     
69.falling;考查分詞短語作后置定語,the phosphorous 與動詞fall存在邏輯上的主謂關(guān)系,故用現(xiàn)在分詞短語作后置定語.   
70.a(chǎn)re joined;考查系表結(jié)構(gòu),這里joined作形容詞,與系動詞are構(gòu)成系表結(jié)構(gòu),句意為"熱帶雨林和沙塵在這個星球上是聯(lián)系在一起的".

點(diǎn)評 語法填空是在語境中考查語法知識的運(yùn)用能力,解題時首先快速瀏覽短文,掌握大意,在讀懂短文的基礎(chǔ)上,結(jié)合短文提供的特定的語言環(huán)境去逐句分析,逐題解答.扎實(shí)的語法功底加上準(zhǔn)確的理解是解答語法填空題的關(guān)鍵.

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