17.This disease is second only _______ heart attack as a cause of death all over the
题目
17.This disease is second only _______ heart attack as a cause of death all over the
world.
A.to B.of C.with D.from
18.The word is new to us.You'd better ______ in the dictionary.
A.look at it B.look for it C.look it up D.look it out
19.If there is no one _______ him with the preparation,he will have to put off the
meeting.
A.help B.to help C.helps D.helped
20.As soon as she _______ open the letter,Mrs.White will find out what has happened to
her husband.
A.tears B.is tearing C.will tear D.has torn
21.______ the government argees to give extra money,the theatre will have to be closed
next month.
A.Unless B.If C.Since D As
答案是17.A18.C
19.B20.A21.,可我不理解,麻烦帮我解答下
答案
17.be secondary to对...处于次要地位的..18.look up查字典.不过look up应接a word不应接a dictionary.如果要接应用consult19.否定词后接不定式.20.主将从现21.除非.看句意.
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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