社区获得性肺炎最常见的致病菌（）
A.克雷伯杆菌
B.金黄色葡萄球菌
C.肺炎链球菌
D.肺炎支原体
E.嗜肺军团菌
参考答案：C
阅读对话，判断正误，用“√”“×”表示。
A: Come here, Helen. What's that on the desk?
B: It's a clock,
A: What's the time?
B: It's seven o'clock.
A: It's time to go to school.
B: OK. Let's go by bike.
( )1. It's a clock on the desk.
( )2. It's six o'clock.
( )3. It's time to go to school.
( )4. Let's go to school by bike.
