—___________ are you?
—I'm twelve. [ ]
A. How many
B. How much
C. How old
D. When
答案:C
天气指一个地方______内大气的风雨、阴晴、冷热等状况;气候则指一个地区______的平均天气状况.
原发性高血压最常见的并发症是()()
A.心肌梗死
B.脑卒中
C.慢性肾功能不全
D.主动脉夹层动脉瘤
E.心力衰竭