2019年消费者权益日主题是“信用让消费更放心”。()
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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.