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

In 1492 Christopher Columbus made his first (voyager) to the New World, (probably) landing (on the) island (which) he named San Salvador.（）

A.voyager
B.probably
C.on the
D.which

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

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