单项选择题

A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes.
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单项选择题
Which of the following statements is true
A．The author is angry that the earth’’s natural resources are being destroyed by human’’s enemies.
B．People are turning a deaf ear to their own destructive behaviors towards earth.
C．People should exploit more natural resources to end the current energy shortage.
D．People feel helpless in saving the earth.
单项选择题
Those who even fail to complete their high school studies________.
A．are unlikely to find stable employment until the age of 25
B．usually attend vocational schools to get the required skills
C．cannot find any jobs at all until the age of 25
D．usually find jobs in the service industry
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