(﹣1)1+(﹣1)2+(﹣1)3+…(﹣1)2006的计算结果是[ ]
A.2006
B.﹣2006
C.﹣1
D.0
答案:D
用括号内所给动词的适当形式填空。
小题1:There was a loud noise while Lily _______________ (listen) to music in her study.
小题2:It is very important ________________ (not give) your goldfish too much food.
小题3:Look! The audience __________________ (clap) their hands at the theatre .
小题4:---_________ you_________ (hear) from him recently? --- Not yet.
小题5:Listen! The radio says something bad ______________ (happen) last night.
小题6:The parade was so wonderful that all of us couldn’t stop _____________ (take) photos.
小题7:There ________________ (be) a class meeting this afternoon, isn’t there?
小题8:Computers __________________ (control) by programs .
小题9:The hot water must _________________ (keep) away from the children .
小题10:_________________ (not throw)litter everywhere, children.
下列抗原中属非TD抗原的是()
A.类毒素、外毒素
B.脂多糖、荚膜多糖
C.聚合鞭毛、内毒素
D.卵白蛋白、牛血清白蛋白
E.聚乙烯基吡咯烷酮和DNA-聚蔗糖