锡青铜的自由线收缩率为（）%。A.1.6 B.1.4 C.1.3 D.1.2

预测期限的确定中，在收益流趋于稳定前的逐年预测期一般为( )年。

A．2

B．3

C．4

D．5

合成洗涤剂引起的主要环境问题是（）

A.水体富营养化

B.危害水生生物

C.造成鱼类畸形

D.污染土壤环境

E.促进重金属向植物的转移

E

It is often difficult for visitors to understand Americans lack of desire for privacy(隐私) . They are not a nation of walled gardens and closed gates. Their yards normally run into one another without fences, they often visit one another’s homes without being invited or telephoning first, they leave their office doors open while they work.

Their lack of desire for privacy probable results from their history as a nation. America is a big country. There have never been walled cities in the United States, nor was there the need for Americans to protect themselves from neighboring states. During the early years, America had so few settlers that neighbors were very important, they were not to be shut out by doors and fences. Neighbors offered protection and helped in the hard work of settling the land. They depended upon each other.

From the nation’s early history has come the desire for openness rather than privacy. Visitors will notice this desire in a number of small ways, there may be rooms in American homes that do not have doors or that have glass walls. If you notice that people forget to close your door when they leave your room, do not think that this is rude, help them to learn that you would like it to be closed, or else become used to new ways. In either case, be patient with the differences.

72. According to the passage, visitors to America sometimes have difficultyunderstanding _____.

A .Americans’ openness                              B. American’s lack of desire for privacy

C. Americans’ way of home                     D. American’s style of life

73. During the early years, people were never shut out by doors because _________.

A. they were neighbors                              B. they were friends

C. they depended on each other            D. they got used to that

74. Visitors will notice American’s desire for openness in a way ___________.

A .they walled their houses with glass 

B. they leave the office doors open while working

C. they never have fence                          

D. they depended upon each other

75. Which of the following is the best title for the passage?

A .No Walled Cities.                                       B. The Early Settlers

C. Americans’ Lack of Desire for Privacy          D. be Patient with Differences

下列有关被动控制的表述中，正确的是( )。

A．面向过去的控制

B．面向未来的控制

C．面向现实的控制

D．开环控制

下列概念中，不属于法律意义上的物的是( )。

A. 砖石
B. 建筑物
C. 资金
D. 建筑设备