A. Technology has caused a severe smartphone addiction. B. Students did not pay attention while he was lecturing. C. He failed to earn a reward for creating a useful app. D. Students ignored classes and checked their phones.
A. Prevent students from using their phones too often. B. Reward students who do not use their phones on campus. C. Provide students with easy access to online stores. D. Warn students who look at their phones in class.
About 500,000. B. About 100, 000. C. About 1,200. D. About 10,000.
微信支付 
支付宝支付