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【单选题】
Read the paragraph below. Then carefully consider the questions that follow, and write the letters of the best responses. The United States has always been a diverse society. In 1673, more than three centuries ago, a visitor to what is now New York City was astonished to find that eighteen languages were spoken among the city's eight thousand inhabitants. By the middle of the nineteenth century, so many people from so many lands had come to the United States that the novelist Herman Melville exclaimed, "You cannot spill a drop of American blood without spilling the blood of the whole world." One can only imagine what Melville would say today! The United States has become the most diverse society on the face of the Earth. For more than a century, most immigrants to the United States were Europeans---Irish, Germans, Engiish, Scandinavians, Greeks, Poles, Italians, and others. Together with African Americans, they made America the "melting pot" of the world. Today another great wave of immigration---more than one million people a year, mostly from Asia and Latin America---is transforming the United States into what one writer has called the "first universal nation," a multicultural society of unmatched diversity. 1. The primary purpose of this paragraph is to __________.
A.
inform readers that the United States is and always was a diverse society
B.
persuade readers that a multicultural society is the best type of society
C.
entertain readers with colorful facts about the United States
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【简答题】v. [不用于被动语态]与...相似,像..._____
【判断题】平键都是通过挤压的方式固定在键槽中,使轴和轴上零件构成连接。
A.
正确
B.
错误
【单选题】在如图 所示电路中,若 u i = —0.5v .则输出电流 i o 为( )
A.
1OmA
B.
5mA
C.
一 5mA
【单选题】如图所示电路中 U S = 10V , I S = 4A 时,电流 I = 5A ;若 U S =- 5V , I S = 1A ,则电流 I 变为- 1A ;则 U S = 2V , I S =- 4A 时, I = ( )
A.
- 6.2A
B.
3A
C.
- 1.4A
D.
1A
【单选题】在烯烃与HX的亲电加成反应中,主要生成卤素连在什么位置 ( )
A.
含氢较少的碳上
B.
含氢较多的碳上
C.
符合反马氏规则
D.
不能确定
【单选题】在烯烃与 HX 的亲电加成反应中,主要生成卤素连在含氢较 ( ) 的碳上
A.
B.
C.
不能确定
D.
——
【单选题】在烯烃与HX的亲电加成反应中,主要生成卤素连在含氢较 的碳上 ( )
A.
B.
C.
不能确定
【单选题】药物中最常见的酰胺、酯类,一般来说溶液的pH值增大时
A.
不水解
B.
愈易水解
C.
愈不易水解
D.
水解度不变
【单选题】药物中最常见的酰胺、酯类,一般来说溶液的pH增大时
A.
不水解
B.
愈易水解
C.
愈不易水解
D.
水解度不变
E.
呈U型线
【单选题】药物中最常见的酰胺、酯类,一般来说溶液的PH增大时
A.
不水解
B.
愈易水解
C.
愈不易水解
D.
水解度不变
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