消费纠纷投诉渠道有哪些。全国12315互联网平台，智慧315，12315热线。()
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2019年消费者权益日主题是“信用让消费更放心”。()
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.
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