大气的垂直分层中，气温随高度增加而降低，容易成云致雨的大气层是
A．电离层
B．平流层
C．对流层
D．高层大气
答案：C
Between the two roads a TV tower called “Skyscraper Tower”.
A．stands
B．standing
C．which stands
D．stand
细胞平板培养
