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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 研究发现大量的非洲沙尘能吹过大西洋到北美和南美降落.非洲的沙尘暴会损害大洋彼岸的空气质量,但是新的研究表明暴雨也会带来一些好处.据发现平均每年有28million 立方的撒哈拉沙尘降落在南美的亚马逊河流域.科学家认为沙尘是植物养分的重要供应者,因为沙尘中含有的磷是植物生长所需要的.事实上,每年空中落下的磷和河水带走的磷的数量基本平衡.浓密的热带雨林和沙尘在这个星球上是联系在一起的.

解答 61.a;考查冠词,a large amount of 是固定短语,意为"大量的",后接不可数名词.
62.across;考查介词,这里介词短语  across the ocean作后置定语,修饰名词 air quality.
63.shows;考查动词,这里讲述一种事实情况,用一般现在时,主语 new research 为单数形式,所以用第三人称单数形式shows.      
64.It;考查固定句型,It is found that…是固定句型结构,意为"据发现…".        
65.provider;考查名词,前面有不定冠词an,所以这里要用可数名词的单数形式,an important provider意为"一个重要的供应者".
66.surprising;考查分词做形容词,现在分词作形容词修饰物,过去分词作形容词修饰人,这里句子的主语是it,所以用现在分词作形容词.     
67.which;考查关系代词,分析句子结构可知这是一个非限制性定语从句,先行词为 phosphorous(磷),所以关系代词用which.  
68.to grow;考查动词不定式,这里用不定式表示目的,句意为"这是植物生长所需要的营养".     
69.falling;考查分词短语作后置定语,the phosphorous 与动词fall存在逻辑上的主谓关系,故用现在分词短语作后置定语.   
70.are joined;考查系表结构,这里joined作形容词,与系动词are构成系表结构,句意为"热带雨林和沙尘在这个星球上是联系在一起的".

点评 语法填空是在语境中考查语法知识的运用能力,解题时首先快速浏览短文,掌握大意,在读懂短文的基础上,结合短文提供的特定的语言环境去逐句分析,逐题解答.扎实的语法功底加上准确的理解是解答语法填空题的关键.

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