Wehavetowaitforthebus,______?
A、havewe
B、haven’twe
C、dowe
D、don’twe
A、生后24小时内出现
B、7-14天消失（早产儿3~4周）
C、血清胆红素≤221umol/L
D、除轻度黄疸外一切情况正常
In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
A、that
B、this
C、what
D、which
I'dliketoremindyouthatthereisno_____onthepartofsuspectstoanswerquestions.
A、obligation
B、evidence
C、transaction
D、motivation