CRH380A统型动车组采用何种受电弓？

In modern society, people use money every day. It seems that it is very important in our life. That’s because without money you can’t buy any goods(商品) you want. But I think few people know the history of money.

Long ago, people did not need money. They lived on wild animals, fruits and other plants. As time passed, people learned to raise animals and crops. Sometimes, families produced more than they needed, so they started to trade with other families. Later, people began to use money as a means of exchange. However, it was not the kind of money we use today. They used shells, rice, salt, large stones, etc.

During the 600s BC, people began using coins as money. They soon found that coins were easier to carry than goods and lasted a long time. Later, countries began to make their own coins.

The Chinese were the first to use paper money, probably as early as the 11^th century. The Italian traveler Marco Polo saw the Chinese using money when he visited China in the 1200s. However, European countries did not start using paper money until 1600s.

Today, we have many ways to pay for things. We do not use coins or paper money. Often, people prefer to pay for things by card. Paying with a card is easier and safer than carrying around a lot of “real” money.

小题1:  People used ________ as a means of exchange before the 7^th century BC.

A. paper money       B. card          

C. large stone         D. coins

小题2:From the passage, we know that European countries used paper money in the ________.

A．11^th century

B．12^th century

C．16^th century

D．17^th century小题3:Which of the following is TRUE in this article?

A．Marco Polo was from Canada.

B．Chinese used paper money earlier than Italy.

C．Today people often prefer to pay for things by salt.

D．Carrying around much “real” money is easier and safer than Paying with a card.

急性睾丸疼痛常见疾病声像图有（）①睾丸扭转：睾丸明显增大；位置上移，CDFI：血流减少或没有血流信号②睾丸脱臼：一侧阴囊空虚，同侧股部的皮下组织与肌层间可见正常睾丸回声，伴同侧精索轻度扭转③睾丸梗死：睾丸形态异常，内见圆形边界清晰的异常低回声区，伴附睾肿大；

A.①③

B.①③④

C.①②③④

D.②

E.②③④

“同意谁，就把豆子丢在谁的碗里”。这幅“草根民主”的真实写照，记载着六十多年前晋察冀边区的农民用豆粒作选票行使自己民主权利的一幕。用“丢豆子”的方法进行的选举，具有当今的特征 [ ]

①直接选举 ②间接选举 ③差额选举 ④等额选举

A、①②

B、③④

C、①③

D、②④

我国许多城市(特别是沿海、沿湖流域)禁止使用含磷洗涤剂(其中磷以三磷酸钠形式存在)，其主要原因是_______．

A．含磷洗涤剂有毒

B．避免磷污染水体，引起藻类大量繁殖

C．降低洗涤剂成本

D．磷资源缺乏