— Would you please not make so much noise?
—__________, we will be quiet.
A：No, we will
B：No, we won't
C：Sorry, we won't
D：Sorry, we will
（1）空气的成分按体积分数计算，大约是：氮气约占____ ，氧气约占____ ．
（2）排放到空气中的有害气体物质，为____、____ 、____ ．
与南北两极点之间距离相等的纬线是
