—Where he go on vacation?
—He went to the mountains.[ ]
A. is
B. does
C. has
D. did
答案:D
引起化脓性脑膜炎的常见细菌包括()
A.金黄色葡萄球菌
B.肠球菌
C.流感嗜血杆菌
D.肺炎链球菌
E.脑膜炎奈瑟菌
蒸汽中的盐分主要源于锅炉排污水。