1、题目28:I saw Jeff in the park.He () on the grass and reading a book.

A. 　crazy

B. 　lonely

C. 　hungry

D. 　sleepy

A. 　{x|-1<x<3}

B. 　{x|x>3或x<-1}

C. 　{x|-3<x<1}

D. 　{x|x>1或x<-3}

A. 　go

B. 　to go

C. 　goes

D. 　went

A. 　look for

B. 　pay for

C. 　ask for

D. 　wait for

A. 　discussed

B. 　is discussing

C. 　was discussing

D. 　has discussed

A. 　symbol;culture

B. 　symbol;cultures

C. 　symbols;culture

D. 　symbols;cultures

A. 4

B. 3

C. 2

D. 1

A. 　0∈A

B. 　3/4∈A

C. 　{0}包含于A

D. 　-π∈A

A. 　2x+1

B. 　2x-3

C. 　2x-5

D. 　2x-7

A. 　were washing

B. 　had washed

C. 　was washing

D. 　washed