A:x>1
B:x≥1
C:x≠1
D:x≥0且x≠1
As more and more cars are produced and used, the emission from their exhaust pipes contains an even larger volume of ____ (poison) gas.
夏天,用冷水洗过的两件完全相同的湿衣服,都展开挂在晾衣绳上,一件在阳光下,另一件在树荫下,如图所示.阳光下的湿衣服干得快.请解释这个现象.