人工干燥脱粒时，干燥球果的温度一般在（）之间。A、5-10℃ B、36-60℃ C、

The USA is a land of immigrants. Between 1815 and 1914, the world witnessed the greatest peaceful migration in its history: 35 million people, mostly Europeans, left their homelands to start new lives in America. Why did these people risk everything by leaving their homes and families?

First, what forced emigrants to make the decision to leave? One major cause for European farmers to leave was the rise in population which in turn led to land hunger. Another was politics. There was an increased taxation（税收） and the growth of armies, and many young men fled eastern Europe to avoid being forced to join the army.

Physical hunger provided another pressing reason. Following the collapse （衰退）of the economy of southern Italy in the 1860s, hundreds of thousands decided to start a new life in America. Religion also encouraged millions to leave the Old World.

In short, people chose to leave their homes for social, economic and religious reasons. As a result, by 1890 among a total population of 63 million, there were more than nine million foreign-born Americans.

But what were the attractions? First of all, there was the promise of land which was so scarce in Europe. Next, factories were calling for workers, and pay conditions were much better than back home. Men were needed to open up the West and build the long railroads, and new towns needed settlers to live in and to develop business. There was the space for religious people to practice their faith in peace.

This immigration meant that by around the 1850s Americans of non-English had started to be more than those of English. As we know, there were losers. To start with, there were those unwilling immigrants, the slaves who had been used as a source of cheap labour. Nor should we forget the equally unlucky American Indians. By 1860 there were 27 million free whites, four million slaves and a mere 488,000 free blacks.

Nowadays, the USA is still seen by millions as the Promised Land. As always, it remains an attractive place to those who think it will offer them a second chance.

小题1:What is not the cause for people to leave their homeland?

A．The search for religious freedom.

B．The search for adventure.

C．Unwillingness to join the army.

D．Economics.小题2:Why was life of the 19th Century European farmers difficult?

A．There was no land.

B．There was no peace.

C．The population had gone down.

D．There were too many of them.小题3: Which of the following was not an attraction of the USA?

A．Employment

B．A healthy life

C．freedom of religion

D．Business opportunities小题4:What is the topic of this passage?

A．The USA is still seen by millions as the Promised Land.

B．The USA is a land of immigrants.

C．Religion encouraged millions to leave the Old World.

D．About one-eighth of non-native born Americans live in the USA in 1890.小题5: The American Indians __________.

A．were as fortunate as the slaves

B．were more unfortunate than the slaves

C．were the most unfortunate

D．were as unfortunate as the slaves

患者，女，68岁，肠梗阻术后2天，突然出现左下肢疼痛。查体：体温38.2℃，呼吸20次／分，脉搏88次／分，血压125／85mmHg，神清，痛苦貌，心肺（-），左下肢肿胀明显，触痛，浅静脉扩张，左股三角区可扪及条索状物。

该患者最可能的诊断是（）。

A.左下肢急性淋巴管炎

B.左下肢丹毒

C.左下肢急性淋巴结炎

D.左下肢血栓性浅静脉炎

E.左下肢深静脉血栓

上下颌牙咬合过紧，且牙本质过敏不能磨出支托窝时，下颌后牙的牙支托可以放在（）

A.近中边缘嵴

B.远中边缘嵴

C.颊沟区

D.舌沟区

E.舌外展隙

城市基准地价是( )年期的土地使用权价格。

A．无限
B．各用途法定最高出让
C．基准日后的剩余
D．转让剩余

对调制信号（）后，再进行调频，即可得到调相信号。

A.积分

B.微分

C.反相

D.调幅