10.has seen [考查时态和主谓一致。根据时间状语In recent years可知,本处应用现在完成时,主语the Saturday before Christmas为单数,故用has seen。]
单句语法填空
1.Dr.Fleming's ________ (discover)of penicillin occurred in 1928.
2.The number of tigers has reduced ________ (abrupt)in the last fifty years.
3.He is a young artist with great ________ (expect).
4.We cannot emphasize too much the ____ (important)of learning English.
5.The paper seems to me of no ________ (practice)importance.
6.The soldiers had to retreat when they were ________ (beat)in battle.
7.Speech ________ distinguish)human beings from the animals.
8.Each unit leader needed a flag,or colour,to be easily seen for ________ (identity)during a battle.
9.Read this story,________ you will realize that not everything can be bought with money.
10.________ (arm)with the information you have gathered,you can set about preparing your business plan.
答案 1.discovery 2.abruptly 3.expectation 4.importance 5.practical 6.beaten 7.distinguishes8.Identification 9.and 10.Armed
In parts of Africa, the sky is filled with a dark cloud. But this is no rain cloud. It is a living cloud made of billions of locusts that are traveling across the continent eating everything in their path.
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