C.to;as
D.by;for
解析:句意:钱学森作为一名著名科学家而闻名于世。the world此处表示“世人”,前用be known to;后一空用as表示“作为”。
答案:C
15.The sad look on her face suggested that she ______ the exam,and her mother suggested that she ______ her teacher for help.
A.fail;turn to
B.failed;turn to
C.should fail;should turn to
D.failed;turned to
解析:此句含两个suggest,前一个表示“表明”,后面宾语从句应用真实语气,此处应用一般过去时;后一个表示“建议”,后面宾语从句谓语应用(should)do。
答案:B
16.Because of his strange clothes,he immediately became the ______ of attention when he entered the office.
A.signal
B.adjustment
C.focus
D.symbol
解析:句意:因为他的奇装异服,当他进入办公室时立刻成为众人注意的焦点。focus“焦点”。
答案:C
17.The flood this summer caused serious ______ to the crops in Northeast China.
A.damage
B.harm
C.hurt
D.injury
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