杨某刚满16岁时进工厂当了工人，每月收入700元。除交父母一部分生活费外，其余都积攒下来，一年时间已经有2000多元积蓄，在未征得父母同意的情况下，杨某自作主张花1200元买了一件艺术品。由于父母反对，杨某决定将该艺术品退还给商店，但商店不同意。根据法律规定，杨某购买艺术品的行为属于（）
A.无效民事行为
B.有效民事行为
C.重大误解的民事行为
D.显失公平的民事行为
参考答案：A
| 完形填空。 | |||
| Mosquitoes(蚊子)can be seen everywhere all over the world, especially in summer. And there are more than 2,500 kinds of them. __1 _likes the mosquito, but the mosquito may like you. She thinks your blood is delicious. She ? Yes , she. It’s true that the male(雄性)mosquito doesn’t bite and only the female mosquito bites because she 2 blood to lay eggs. She is always 3 things or people she wants to bite. If she likes what she finds, she will bite. But if she doesn’t like your blood, she 4 to someone else for more delicious blood. Next time a mosquito bites you, just remember you’re different from others. If the mosquito likes you, she will land on your body 5 letting you know. She bites you 6 quickly and quietly that you may feel nothing. After she bites, you will have an itch(痒)on your body because she puts something from her mouth together with your blood. By the time the itch begins, she has 7 . And then what happens? Well, after her delicious 8 ,it’s dark. The mosquito feels 9 . She just wants to find a place to have a good rest. There, on a leaf or a wall, she begins to lay eggs, 10 eggs. | |||
| ( )1.A.Everyone ( )2.A.needs ( )3.A.finding ( )4.A.will turn ( )5.A.with ( )6.A.so ( )7.A.flies away ( )8.A.breakfast ( )9.A.tiring ( )10.A.3 hundreds | B. No one B. need B. wants B. turns B. without B. such B. flew away B. dinner B. tired B. hundred of | C. Someone C. want C. looking for C. turn C. after C. very C. flown away C. lunch C. relaxing C. hundreds of | |