（以下2题共用备选答案）
儿童型息肉的最主要临床特点是（ ）。
A．多发生在青年儿童，常有家族史，病变多累及小肠，很少癌变
B．多发生在40岁以上，不一定有家族史，病变2／3直肠壶腹，常有里急后重
C．多在青年期有症状，有家族史，多累及直肠结肠，癌变倾向很大
D．主要发生在儿童，无家族史，多累及直肠，无癌变
E．多在30-40岁，和遗传有关，病变散在大肠，有癌变倾向，有时伴有软组织肿瘤
参考答案：H
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| Nowadays we can see more and more electric bikes in the street. Electric bikes are easy to 1 . They run fast and make no pollution. So they become very 2 in many big cities in China. But the electric bikes also 3 more traffic accidents. So China plans to make a new rule 4 the electric bike riders. If an electric bike is 5 than 40 kilos and can go faster than 20 kilometers an hour, its rider must get a 6 . It means riders have to pass driving tests 7 they ride their electric bikes on the road. People have different ideas about the plan. 8 welcome the plan because they think it will make the street much safer. But some are not 9 the new rules at all. One rider said, "I don't want to get a license or anything. That's too much 10 ." What's your idea? | |||
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