田径场助跑道的宽度是（）A.1.00-1.05米 B.1.05-1.10米 C.1.

In 1901, the citizens of Colorado Springs in the USA decided to collect everyday items and to seal (封住）them in a special box. The box was marked “To be opened after midnight, December 31^st, AD 2000”，and was kept in the Colorado College Library.

One hundred years later, on the appointed (约定）day, 300 people gathered to watch the opening of the box. Many in the crowd were the descendants (后代）of people who had placed things inside the box.

When the box was opened after midnight, the things inside the box were in very good condition. There were newspapers, photos, diaries, name cards, family trees, books and lots of letters, including one written by Theodore Roosevelt, who became the President of the USA later that year. One of Roosevelt’s friends lived in Colorado Springs at that time.

Many of the letters were written to their descendants. They describe the hopes that the people of 1901 had for the people of the next century. At that time, Colorado Springs had just a few thousand people. Now nearly half a million people live there.

Colorado College Library has scanned the materials and put them on a website. Cecil Muller, whose grandfather had placed a collection of postcards in the box, said that the time capsule was a great treasure. “This is a wonderful educational resource(资源）.  We can learn so much about our history,”he said. “I never knew my grandfather, but now I feel very close to him. ”

小题1:According to the passage, “time capsule” means ______.

A．a collection of clocks and watches

B．a machine for travelling through time

C．a collection of items for people to look at in the future

D．a collection of unwanted items小题2:Many of the letters in the time capsule talked about   .

A．the history of the town

B．the people who lived in the town

C．the politics of the USA

D．people’s hopes for the future小题3:Cecil Muller says that the time capsule ______.

A．helps him to get to know his grandfather

B．is worth a lot of money

C．brings back his memories of his grandfather

D．helps him to remember his younger day

“封建亲戚，以藩屏周”反映了西周时期实行的政治制度是[ ]

A．奴隶制

B．世袭制

C．分封制

D．郡县制

在计算速动比率时，要从流动资产中扣除存货部分再除以流动负债。这样做的原因在于流动资产中( )。

A．存货的价值较大

B．存货的质量不稳定

C．存货的变现能力较差

D．存货的未来销路不定

翻译：故物贱之征贵，贵之征贱，各劝其业，乐其事，若水之趋下，日夜无休时，不召而自来，不求而民出之。（司马迁《史记·货殖列传序》）

什么叫重选法？矿粒在介质中沉降时受几个力的作用？