[单项选择]According to the passage, the author would agree with which of the following statements concerning the geographic segregation of black Americans Ⅰ. Black Americans segregation tends to be more intense than among other minorities, such as Hispanics and Asian-Americans. Ⅱ. The poorest black Americans tend to live dispersed among more affluent blacks. Ⅲ. Black segregation has taken the form of a vicious circle, perpetuating its own causes.
A. (A) Ⅰ only
B. (B) Ⅱ only
C. (C) Ⅰ and Ⅱ only
D. (D) Ⅰ and Ⅲ only
E. (E) Ⅰ,Ⅱ, and Ⅲ

[单项选择]According to the passage, the author would agree with which of the following statements concerning the geographic segregation of black Americans Ⅰ. Black Americans segregation tends to be more intense than among other minorities, such as Hispanics and Asian-Americans.Ⅱ. The poorest black Americans tend to live dispersed among more affluent blacks.Ⅲ. Black segregation has taken the form of a vicious circle, perpetuating its own causes.
A. (A) Ⅰ only
B. (B) Ⅱ only
C. (C) Ⅰ and Ⅱ only
D. (D) Ⅰ and Ⅲ only
E. (E) Ⅰ, Ⅱ, and Ⅲ

[单项选择]According to the passage, why would the landowners respond to environmental concerns a. They wish to stimulate economic growth. b. They wish to improve their public image. c. They have a tradition of cooperating with the government. d. They are afraid of federal legislation.

[单项选择]According to the passage, the author mentioned that "when once the staff of the Historic American Engineering Record wished to have drawings made of machines and isometric views of industrial processes for its historical record of American engineering" in order to ______.
A. point out the inability of engineering students.
B. point out the omission of conventional engineering lessons.
C. praise the architectural schools.
D. encourage contests of such kind.

[填空题]According to the passage, the author had a predisposition for panic.

[判断题]

According to the passage, inland waterway travel was most popular in the early 1800s.

[填空题]According to the passage, the Harvard University was named after a young minister John Harvard who, upon his death, left his library and half his estate to the institution two years after its establishment.

[单项选择] Regeneration of Limbs Most people would agree that it would be wonderful if humans could regenerate limbs. Those who have lost their arms or legs would be complete again. The day is still far off when this might happen. But in the last 10 years, doctors have reported regeneration in smaller parts of the body, most often fingers. Regeneration is not a newly-discovered process. For centuries, scientists have seen it work in some kinds of animals. Break off a lizards (蜥蜴的) tail, for example, and it will grow a new tail. Scientists now are looking for a way to turn on this exciting ability in more highly-developed animals, including humans. Their experiments show that nerves, cell chemistry and the natural electric currents in the body all seem to have a part in this process. The body of every animal contains general purpose cells that change into whatever kind of cells the body needs. Animals such as the lizard or salamander (蝾螈) use these cells
A. humans can never regenerate limbs
B. human limbs may be regenerated on some animals first
C. humans might be able to regenerate limbs in the future
D. regeneration of human limbs will soon become a reality

[单项选择]According to the passage, what is Franklin still well remembered as（）
A. As one of the greatest American scholars.
B. As one of America’s most ingenious inventors.
C. As one of the founding fathers of the United States.
D. As one of the most famous activists for human rights.

[填空题]S1. According to the passage, a worker primarily works for_______________________.

[单项选择]What is true according to the passage [A] Helen was born blind and deaf. [B] A sickness caused her to be blind and deaf. [C] Helen lost her sight and hearing at the age of 19.