问题 单项选择题

为保证一重大项目机械产品的可靠性,试验小组需要对其进行连续测试。测试人员每隔5小时观察一次,当观察第120次时,手表的时针正好指向10。问观察第几次时,手表的时针第一次与分针呈60度角?()

A.2

B.4

C.6

D.8

答案

参考答案:D

解析:从第1次观察到第120次观察,共计119个周期。假定再有第121次观察,此时时针指向下午3点,而从第1次观察到第121次观察,共计120个周期,因此经过的时间恰好为12的整数倍,故第1次时针指向也为下午3点。要使得手表的时针与分针呈60°夹角,则意味着时针指向2点或10点。从3点出发,每个周期加5个小时,可知在经过7个周期后第一次实现这一目标,故在第8次观察时,手表的时针与分针第一次呈60°角。

阅读理解

阅读理解。

     This is time of year when we think about giving and receiving presents. Can you find a little extra to

give? On this page we suggest a few organizations you might like to help.

Littleton Children's Home

     We don't want your money, but children's toys, books and clothes in good condition would be very

welcome.

     Also-we are looking for friendly families who would take our children into their homes for a few

hours or days as guests. You have so much-will you share it?

     Phone Sister Thomas on 55671.

     Children's Hospice

     We look after a small number of very sick children. This important work needs skill and love. We

cannot continue without gifts of money to pay for more nursing staff. We also need story books and toys

suitable for quiet games.

     Please contact The Secretary, Little Children's Hospice, Newby Road.

     Street Food

     In the winter weather, it's no fun being homeless. It's even worse if you're hungry. We give hot food

to at least fifty people every night. It's hard work, but necessary. Can you come and help? If not, can

you find a little money? We use a very old kitchen, and we urgently need some new saucepans. Money

for new ones would be most welcome indeed.

     Contact Street Food, c/o Mary's House, Elming Way, Littleton. Phone 27713.

     Littleton Youth Club

     Have you got an unwanted chair?-a record player?-a pot of paint?

     Because we can use them!

     We want to get to work on our meeting room!

     Please phone 66231 and we'll be happy to collect anything you can give us.

     Thank you!

     The Night Shelter

     We offer a warm bed for the night to anyone who has nowhere to go. We rent the former

Commercial Hotel on Green Street. Although it is not expensive, we never seem to have quite enough

money. Can you let us have a few pounds? Any amount, however small, will be such a help.

Send it to us at 15, Green St, Littleton. Please make check payable to Night Shelter.

1. Reading the passage, you might like to help these organizations which work for      .

A. homeless and sick children

B. less fortunate members of our society

C. hungry people who have no beds to sleep in

D. friendly members of our society to help others

2. If you like children and can offer a happy family to a homeless child, you may go to      .

A. Street Food  

B. Night Shelter

C. Children's Home  

D. Children's Hospice

3.We can infer that       .

A. there are too many social problems in this country

B. people are very poor during the time for giving presents

C. warm-hearted people like to give away money

D. this passage is taken from a local newspaper

4. If your child has grown up, you may take the child's things to        .          

A. Children's Home and Children's Hospice

B. Youth Club and Children's Home

C. Children's Hospice and Night Shelter

D. Youth Club and Night Shelter

单项选择题 A1/A2型题