—The Internet has made communication much more ________.

—I agree. For example, I can communicate with my friends on WeChat at any time.

A. popular B. necessary C. important D. convenient

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Are you still worried about how to get your phone charged(充電)? Now, a 19?year?old teenager can help you to solve this problem. He has invented a phone charger which uses energy from your own body to charge your phone.

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