问题 单项选择题

城市生态系统向结构复杂、能量最优利用、生产力最高的方向的演化称为()演替。

A.反向

B.正向

C.逆向

D.符合自然规律

答案

参考答案:B

解析:城市生态演替是一种更新过程,这是适应外部环境变化及内部自我调节的结果。城市生态系统向结构复杂、能量最优利用、生产力最高的方向的演化称为正向演替;反之称之为逆向演替。

选择题
阅读理解

阅读理解。

Princeton University

Location

     The University is in Princeton, New Jersey. It is an hour's train ride south of New York City and an

hour's train ride north of Philadelphia.

Students

     There are 4,600 undergraduates (本科生). There are also 1,900 graduate students, but Princeton is

unusual among universities in having a student body made up largely of undergraduates.

Faculty

     Princeton has about 700 full-time faculty members (教员). There are another 300 or so part-time and

visiting faculty. All faculty members at Princeton are expected to teach and research.

Degrees

     Princeton offers two undergraduate degrees: the bachelor (学士) of arts (A.B.) degree and the bachelor

of science in engineering (B.S.E.) degree.

Academic Year

     An academic year runs from September to late May and lasts two terms (fall and spring). A normal

course load is four or five courses per term, although many students take extra courses.

Residences

     Princeton provides housing for all undergraduate students. Freshmen and second-year students are required

to spend their first two years in one of five colleges. Each college has its own dining hall, common rooms

and computer centers.

Fees and Expenses (Academic Year 2004-2005)

     Tuition (学费): $29,910

     Room and board: $ 8,387

     Other expenses (books, telephone, etc.): $ 3,083

     Total: $ 41,380

1. How many kinds of faculty members are there in Princeton University?

A. One.

B. Two.

C. Three.

D. Four.

2. In Princeton University, an undergraduate will pay at least _____ for the Academic Year 2004-2005 besides

    tuition.

A. $ 41,380

B. $ 52,850

C. $11,470

D. $ 8, 387

3. In what way is Princeton University different from other American universities according to the text?

A. It has five colleges.

B. Its students are mainly undergraduates.

C. It provides housing for all undergraduate students.

D. All the faculty members at Princeton are expected to teach and research.

4. Which of the following is NOT true?

A. Princeton offers two undergraduate degrees.

B. An academic year lasts about nine months in Princeton University.

C. Undergraduates should spend their first two years in one of five colleges.

D. It's about an hour's train ride from Princeton University to the north of New York City.