题目内容

A．failB．findC．performD．provide

A. fail
B. find
C. perform
D. provide

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A．atB．inC．onD．within

A. at
B. in
C. on
D. within

A．themB．theseC．itD．those

A. them
B. these
C. it
D. those

A．as justB．just asC．becauseD．while

A. as just
B. just as
C. because
D. while

设a，b，c为实数，且|a|-a＝0，|ab|＝ab，[c|+c＝0，则|3b|- |a+b|-|c-b|+|a-c|＝()．

A. 0
B. ．-b
C. b
D. d