如图所示，一个密闭的绝热容器内，有一个绝热且与内壁光滑接触的_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

如图所示，一个密闭的绝热容器内，有一个绝热且与内壁光滑接触的活塞将它隔成A、B两部分，在A、B两部分空间内封有相同质量的空气，开始时活塞被销钉固定，A部分气体的体积大于B部分气体体积，温度相同．若拔出销钉后，达到平衡时，关于活塞的位置，下面说法正确的是（）

A．在原来位置

B．在中间左侧位置

C．在中间位置

D．在中间右侧位置

答案

答案：D

选择题

在由国家有关部门举办的一次大型科普展览中，有一个别具匠心的设计：三扇门上各有一个问题：“污染环境的是谁？”“饱受环境恶化之苦的是谁？”“保护环境的是谁？”拉开门，里面各是一面镜子，照出的是参观者自己。

（1）恩格斯说：“我们不要过分陶醉于我们人类对自然界的胜利。对于每一次这样的胜利，自然界都可能会对我们进行报复。”运用“规律”的观点谈谈你对这句话的理解。(5分)

（2）有人认为：在巨大的自然灾害面前，人类是无能为力的。运用“规律”的观点谈谈你对这句话的看法。(5分)

填空题

Have life insurance Is it enough or maybe too much

Most parents know that they need life insurance. But many would rather have a root canal than shop for the best life insurance policy.
"People don’t think about, ’What will my family do if I am gone and not earning a living ’" says Peter Katt, a fee-only life insurance adviser. "The whole point of this kind of planning is to provide the family with maximum flexibility so they’re not stuck."
(1) Too often, parents make a quick decision, ignoring important considerations. Among their mistakes, one is that they do not buy enough life insurance. (2) "They don’t think that the person who is not bringing in an income needs life insurance," says Greg Daugherty, executive editor of Consumers Union. But if that person dies, the other parent can’t stop working and usually has to pay someone to help care for the family.
(3) Katt recommended that one young couple should buy $3 million for the husband who earns $100,000 a year and $1 million for the stay-at-home wife.
At the same time, many families rely on employer-provided life insurance, but employer-provided coverage is rarely sufficient to support your family. (4) Some employers provide a year’s salary, but that may also fall well short of the amount your family would need to maintain its standard of living.
Some employers let workers buy group life insurance through payroll deductions. That may be a good deal for workers who have health problems that would disqualify them for an individual policy. (5)
Another drawback is that if you leave your job, you may not be able to take your insurance. "Given the job market, most of us are not absolutely certain that our jobs are secure," Daugherty says. (6)
On the other hand, some families buy too much insurance. Not everyone needs life insurance. Some people buy life insurance for babies, which is unnecessary, unless the baby is a child model who is supporting the family, Daugherty says: (7) . Single people and those who have no children to care for usually don’t need life insurance.
Katt says a man with substantial savings in stocks and bonds and other sources of income recently asked him how much life insurance he needs. "I said none," Katt says. (8)
A. Many employer-provided policies provide a death benefit of $10,000 to $25,000 — barely enough to cover your funeral expenses.
B. Families don’t always insure a parent who is staying home to care for the children.
C. "There are people who don’t need life insurance but have it and many more people who need it but are woefully uninsured."
D. The purpose of insurance is to replace the income that a family has been relying on.
E. "Even if you have a lot of insurance at work, it makes sense to have some more insurance on your own."
F. To make insurance more affordable, you may not need to buy the same amount of insurance for both parents.
G. Planning for your death is not a cheerful topic.
H. But if you’re young and healthy, you may be able to get a better rate on your own.