小儿上呼吸道感染常见的病原体是
A.链球菌
B.金黄色葡萄球菌
C.病毒
D.肺炎双球菌
E.支原体
参考答案:C
He’s his purse, but he can’t it.
A. Looks for, find B. finding, look for C. looking for, find D is looking , find
物理实验课教学的程序分为()、()和()三步进行。