1.选择题- (共2题)
Do you love Beats headphones, True Religion jeans, and UGG shoes? These are some of the most popular brands (牌子) around. They are also expensive. But some experts say they are not much better than cheaper brands.
For example, Jim Wilcox works for Consumer Reports. He tested all kinds of headphones. He says that $80 Koss Pro headphones provide basically the same quality (质量) and comfort as Beats. So why do people pay twice or even 10 times as much for the hottest brands?
Experts say it's because fashionable, expensive brands send a message. Brands say “I belong” or “I can afford it.”
Some people think that expensive brand names are worth the price. They say that some designer clothes really are top quality and that they last longer than cheaper brands. Some teenagers choose to wear popular brands because these brands make them feel good about themselves.
Alexandra Allam, 17, likes to buy brand-name products. “I'd rather spend the extra money to get something I know I'll be satisfied with,” she says. Her friend Emmy Swan agrees, saying “As long as you can afford it, it seems reasonable to buy what you want.” But not all teenagers agree. “Spending hundreds of dollars for designer sunglasses is stupid and unreasonable,” says Daniel Steinbrecher, 16. “It's fake (假的) happiness.”
People who are against wearing expensive brand names say that many designer brands aren't any better. “It's wasteful to buy things just because they are popular,” says Edmund Williams, 15. “You'll feel better if you buy things because you like them. If you have extra money to spend, it would be better to give it to people in need.”
2.单选题- (共6题)
A.甲和乙 | B.乙和丙 | C.丙和丁 | D.甲和丁 |

A.衣服受重力、弹力、压力、摩擦力、向心力五个力作用 |
B.洗衣机脱水筒转动得越快,衣服与筒壁间的弹力就越小 |
C.衣服上的水滴与衣服间的附着力不足以提供所需要的向心力时,水滴做离心运动 |
D.衣服上的水滴与衣服间的附着力大于所需的向心力时,水滴做离心运动 |

A.100m | B.111m | C.125m | D.250m |


A.内轨对内侧车轮轮缘有挤压 |
B.外轨对外侧车轮轮缘有挤压 |
C.这时铁轨对火车的支持力等于![]() |
D.这时铁轨对火车的支持力大于![]() |

A.0 | B.![]() | C.![]() | D.![]() |
A.15m/s | B.20m/s | C.25m/s | D.30m/s |
3.多选题- (共2题)
A.当火车以速率v0行驶时,火车的重力与支持力的合力方向一定沿水平方向 |
B.当火车的速率v>v0时,火车对外轨有向外的侧向压力 |
C.当火车的速率v>v0时,火车对内轨有向内的挤压力 |
D.当火车的速率v<v0时,火车对内轨有向内侧的压力 |

A.在最高点A,小球受重力和圆孤的压力 |
B.在最高点A,小球受重力和向心力 |
C.在最高点A,小球的速度为![]() |
D.在最高点A,小球的向心加速度为2g |
4.解答题- (共2题)

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【1】题量占比
选择题:(2道)
单选题:(6道)
多选题:(2道)
解答题:(2道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:2
7星难题:0
8星难题:5
9星难题:3