在自然界中,下列化合物种类最多的是( )
A.酸
B.碱
C.盐
D.有机物
答案:D
12盆花摆成两排,一排摆4盆,另一排摆几盆?列式是[ ]
A.12÷4
B.12÷2
C.12-4
He runs fast and plays football very well. He has a good _____.[ ]
A. sense of humour
B. sense of sports
C. sense of smell
D. musical sense