单项选择题

An organ (is) a group (of tissues) capable (to perform) some special function, as (for example), the heart, the liver, or the lungs.（）

A.is
B.of tissues
C.to perform
D.for example

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单项选择题

(Alike) other forms of energy, natural gas (may be used) to (heat) homes, cook food, and even (run) automobiles.（）

A.Alike
B.may be used
C.heat
D.run

单项选择题

According to paragraph 1, nuclear experts thought that in order to make nuclear power safer the first thing to do should be （）.

A．to improve the training of operators and the design of the reactors’ control systems
B．to inspect nuclear power plants in the Third World
C．to send safety review teams to all the developed countries
D．to hold a meeting on the Chernobyl accident