凡是自然资源都能形成资源资产。 ( )

在数据库的三级模式体系结构中，模式与内模式之间的映像(模式/内模式)实现了数据库的 【5】 独立性。

The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

Many doctors direct their patients to name-brand drugs, but smart consumers know that generic drugs cost half as much as buying name-brand drugs.（）

A. generic drugs cost half as much as buying name-brand drugs

B. buying generic drugs costs half as much as name-brand drugs

C. generic drugs cost half as much as name-brand drugs

D. buying generic drugs cost half as much as buying name-brand drugs

E. to buy generic drugs costs half as much as buying name-brand drugs

合适的体外培养实验室至少具备（）。

A.缓冲室和培养室

B.缓冲室

C.准备室

D.培养室

E.准备室和培养室

公共体育课（）学时计2学分；军事理论课（）学时计3学分。

A.32；32

B.32；36

C.64；64

D.64；72

比德