1.选择题- (共6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.”
Brian was a funny student. He loved watching comedies(喜剧) best and hoped to become a comedy actor one day.
When he heard about the talent show to be held at this school, Brian decided to take part in. He had never acted on stage before, and he was very excited. But some students laughed at him. “You are not funny but silly,” Ken, one of his classmates, said to his face. “No one will like what you do,” another boy also said to him, loudly.
Brian couldn't understand why they were so unkind to him. For a moment, he thought about giving up the show. But he remembered how much his friends liked his jokes, and also his teachers said he was very funny. So he decided to prepare for the show.
Brian did a great job at the talent show. Everyone loved his performance, and he won the first prize! His teachers and friends were proud of him. Even so, Ken told Brian that he was not funny, and that he would never be successful. Brian didn't understand why Ken said so, but he realized that it had nothing to do with him. He confidently continued to work towards his goal.
As the years went on, Brian met more people like Ken. “You'll do a terrible job,” they said to him. Luckily, most people encouraged him and some helped him to become even funnier. He got a lot of opportunities to perform in movies. He was even invited to appear on television. His fans thanked him because his comedies made them feel good when they were unhappy.
Now Brian is a big comedy star! He is doing what he loves best. He never feels stressed like those unkind people, and he laughs all day long!
2.单选题- (共5题)

A.公式中G为引力常量,是人为规定的 |
B.r趋近零时,万有引力趋于无穷大 |
C.ml对m2的万有引力与 m2对ml的万有引力总是大小相等,与ml、m2的大小无关 |
D.ml对m2的万有引力与 m2对ml的万有引力总是大小相等,方向相反,是一对平衡力 |




A.![]() | B.![]() | C.![]() | D.![]() |
A.2.0 × 102 J | B.2.0 × 105 J |
C.2.0 × 106 J | D.2.0 × 108 J |

A.10J,10J | B.10J,30J |
C.-10J,10J | D.-10J,30J |
3.多选题- (共4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.向心加速度的方向始终指向圆心,因此其方向保持不变 |
B.向心加速度的方向始终指向圆心,其大小保持不变 |
C.向心加速度时刻在变化,因此匀速圆周运动是加速度变化的运动 |
D.向心加速度所描述的是角速度变化的快慢 |

A.m1、m2做圆周运动的线速度之比为2∶3 |
B.m1、m2做圆周运动的角速度之比为1∶1 |
C.m1做圆周运动的半径为![]() |
D.m2做圆周运动的半径为![]() |
A.地球绕太阳运行的周期T及地球离太阳的距离r |
B.月球绕地球运行的周期T及月球离地球的距离r |
C.人造地球卫星在地面附近绕行的速度v及运行周期T |
D.已知地球表面重力加速度g(不考虑地球自转) |
4.解答题- (共3题)

(1)飞船在预定圆轨道上运动的周期为多大?
(2)预定圆轨道距地面的高度为多大?
(3)飞船在近地点A的加速度为多大?
(1)从抛出到落地的整个过程中重力所做的功;
(2)从抛出到落地的整个过程中重力做功的平均功率;
(3)落地瞬间重力做功的瞬时功率;
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【1】题量占比
选择题:(6道)
单选题:(5道)
多选题:(4道)
解答题:(3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:9
7星难题:0
8星难题:3
9星难题:0