Which of the following speeds up the process of westward expansion?
A. Population explosion in Europe.
B. Improvement on transportation.
C. People"s hatred for wars.
D. People"s desire to escape exploitation.
2019年4月15日以后,购买的电动自行车要有3C标志。()
All of the following slow down the process of westward movement EXCEPT
A. resistance from the French and the Indians.
B. the fall line in the Virginia frontier.
C. the prohibition order by British government.
D. the California Gold Rush.
浙江省放心消费示范单位中一般要求七天无理由退货的有放心商店、放心网店。()