试题与答案

六价铀矿物

题型:名词解释

题目:

六价铀矿物

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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题型:阅读理解

The Amazing Kids! PenPals Program is a literacy-based (基于读写能力的), traditional letter-writing pen pal program, available to all children aged 5-17 worldwide.

At $10 per child, our program is a low-cost and fun way to help your children practice their literacy skills while they are making new friends. Groups of 15 or more receive a 50% discount.

Children love our program because:

●It helps them develop new (and possibly life-long)friendships.

●It allows them to practice the traditional form of letter writing and correspondence.

●They love getting letters in the mail from their pen pals!

Parents love our program because:

●It offers one of the few remaining choices for finding an established, safe and trusted traditional pen pal program to their children.

●It helps strengthen communication and literacy skills taught in their children’s classroom.

●It helps open their children’s eyes to a larger world, and other cultures and traditions outside their own.

●Many parents remember having a pen pal when they were children and want to give their children the same positive, fun learning experience.

●Parents love helping their children find new friends of their own age and gender.

Frequently asked questions

Why is there a fee?

We are a small, all-volunteer non-profit organization, and the fees help cover our cost of running the program.

How did the Amazing Kids! PenPals Program begin?

The program began as a way of reaching out to the children affected by the devastating (毁灭性的) hurricanes of 2005. Our hope was that by matching young hurricane survivors with a new pen pal, we could help them in their recovery from the trauma (创伤) they experienced.

The program is now available to all children worldwide. We continue to welcome teachers, youth groups or agencies who like to work with hurricane survivors.

How does it work?

Amazing Kids! will match students of the same gender and age with other students who may share similar interests and hobbies, based on the information provided on the registration form.

I’ve completed all forms and made my payment. What happens next?

Someone from Amazing Kids! will contact you once a match has been found. You will be asked to call the other parent, teacher or group leader of the pen pal Amazing Kids! has selected. If both adults agree that the pen pal match is a good one, then the students may begin writing to each other. If the match is determined not to be a good one, Amazing Kids! will try and find an alternative match.

小题1:.If a group of twenty children want to join the program, they should pay _____altogether.

A.$50

B.$100

C.$150

D.$200小题2:.Parents may agree the program helps children_________.

A.travel around the world

B.communicate well with others

C.Meet many famous people

D.get good marks in exams小题3: In the beginning the Amazing Kids! PenPals Program was set up for the kids who ______.

A.suffered from the hurricanes

B.were willing to make pen pals

C.were good at writing letters

D.wanted to help hurricane survivors

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题型:计算题

如图所示,有一块木板静止在光滑且足够长的水平面上,木板的质量为M="4" kg,长度为L="1.4" m;木板的右端停放着一个小滑块,小滑块质量为m=1 kg,其尺寸远小于木板长度,它与木板间的动摩擦因数为μ=0.4,若滑块所受的最大静摩擦力是相同压力下滑动摩擦力的1.2倍,取g="10" m/s2,问:

(1)现用水平恒力F作用于木板上,为了能使木板能从滑块下抽出来,恒力F的大小范围是多少?

(2)若其它条件不变,水平恒力F=28 N,欲抽出木板,水平恒力至少要作用多长时间?

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