稀树草原、斑马成群，是哪个气候类型的自然景观？[ ]
A．热带雨林气候
B．热带草原气候
C．热带沙漠气候
D．地中海气候
答案：B
下列各分子中，所有原子都满足最外层为8电子结构的是
A．H2O
B．BF3
C．PCl5
D．CCl4
________ felt tired but quite happy after ________ sports meeting.
A．Every one of us ; a two days
B．Everyone of us ; the two days
C．Every one of us ; the two—day
D．Everyone of us ; the two days’
