如果小明手上此时有200个大肠杆菌,它繁殖的速度按每30分钟繁殖一代计算,在没有洗手的情况下,4小时后他的手上的大肠杆菌数目是 ( )
Bill is running so fast!I _________believe my eyes.( )
A.needn'tB.shouldn'tC.mustn'tD.can't
There __________two people waiting for you outside now.( )
A.isB.areC.wasD.were
My cousin keeps two pets.One is a lovely cat and ___________ is a beautiful bird.( )
A.otherB.othersC.the otherD.another
We used to buy things in the ____________ but now we usually do it online.( )
A.shopB.museumC.bankD.library
Tom thinks playing ___________basketball is a good way to relax himself.( )
A.aB.anC.theD./