Have you read the book _______ is about the moon? [ ]
A. what
B. it
C. ∕
D. which
答案:D
以下程序段运行结束后,变量x的值为( )。 x=2 y=4 DO x=x*y y=y+1 Loop While y<4
A.2
B.4
C.8
D.20
目前比较被认可的偏头痛发病机制学说有()
A.血管学说
B.神经学说
C.血管神经学说
D.皮层扩散抑制学说