—______ is your pencil case?
—On the desk.[ ]
A. What
B. Where
C. How
答案:B
Steven and Jenny _________ new in school.[ ]
A. is
B. are
尿路结石所致的尿感较常见的病原菌为()。
A.支原体
B.金黄色葡萄球菌
C.变形杆菌
D.屎肠球菌
E.铜绿假单胞菌