How many ______________ are there in the picture?[ ]
A. a bus
B. buses
C. bus
D. some bus
答案:B
下列物体中,占有的空间体积最小的是:[ ]
A.原子核
B.分子
C.地球
D.太阳
Which scarf is ______, the green one or the blue one?
A.good
B.better
C.best
D.the best