蛔虫病以腹痛为主要症状,其疼痛部位主要在()
A.胃脘部
B.脐周部
C.左下腹
D.右下腹
E.痛无定处
参考答案:B
解析:蛔虫病以发作性脐周疼痛为主要症状。
(x-y)2-(y-x)因式分解的结果是( )
A.(y-x)(x-y)
B.(x-y)(x-y-1)
C.(y-x)(y-x-1)
D.(x-y)(y-x-1)
—Did you see a girl in white pass by just now?
—No, sir. I________a newspaper.
A.read
B.was reading
C.would read
D.am reading