引起婴儿腹泻最常见的病原体是()
A.腺病毒
B.巨细胞病毒
C.轮状病毒
D.致腹泻大肠杆菌
E.金黄色葡萄球菌
参考答案:C
—John never comes to school late.
—______. He always come to school first in the class. [ ]
A. So is he
B. So he is
C. So he does
D. So does he
对于一段程序,下列语句中既可以作为定义结点,同时还可以作为使用结点的是______。
A) 输入语句 B) 输出语句 C) 赋值语句 D) 条件语句