⑴I'm listening to music ____           A. but the teacher comes.

⑵Lucy is playing with her dog,____    B. but my friends come to play with me.

⑶The pupils are talking very loudly,____     C. but her mother calls her.

⑷A bus is coming,____                 D. but it starts to rain.

⑸We are having a picnic,____       E. but there are too many people on the bus.

绕地球赤道一周，每天飞行100千米的话，要飞行多少天？（　　）

《元史》卷91《百官志》记载：“行中书省，凡十，秩从一品。掌国庶务，统郡县，镇边鄙，与都省为表里。……中统、至元间，始分立行中书省，因事设官，官不必备，皆以省官出领其事。……凡钱粮、兵甲、屯种、漕运、军国重事，无不领之。”对此理解正确的是（    ）

①“都省”是指管辖河北、山东和山西的行中书省

②行省长官位高权重，掌管地方军事、财政、行政等

③行省长官由中书省委派官员担任

④行省在一定程度上能避免宋朝地方官员无权、人浮于事的局限

斯大林认为：苏联“工业化的中心、工业化的基础，就是发展重工业。”为此，苏联采取的措施是(     )