问题
多项选择题
影响黑色素增加的原因：（）
A、紫外线引起的刺激
B、精神压力
C、内分泌失调
D、癌
E、结核
答案
参考答案：A, B, C, D
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影响黑色素增加的原因：（）
A、紫外线引起的刺激
B、精神压力
C、内分泌失调
D、癌
E、结核
参考答案：A, B, C, D
| 完形填空。 | |||
| In many big cities, there are usually more than one underground line (地铁线). The fastest way 1 in a city is by subway. How to travel by subway? Do you know? Here is some information 2 before you travel by subway. First, you should 3 the right line. If you don't, you will have to 4 and take another one. Second, you need some coins 5 your ticket, because 6 the machines which sell tickets only accept coins. Coins can be changed next to the ticket machines. Or you can go to the ticket office 7 some. 8 you have a prepaid card, you can just go ahead. After you have bought the 9 , you should wait for your subway outside the yellow line. You 10 walk too close to the yellow line. It's dangerous. | |||
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