单项选择题


Questions 19 to 22 are based on the conversation you have just heard.

A．Because every species becomes extinct.
B．Because humans beings are powerful enough to kill other species.
C．Because of over-population.
D．Because human being is still a young species though it is exploiting the environment.
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单项选择题
A．The homeowner is afraid of being accused.B．The house sitter pleads again and again.C．Most house sitters are very poor.D．The homeowner doesn’t want to bother.
A．The homeowner is afraid of being accused.
B．The house sitter pleads again and again.
C．Most house sitters are very poor.
D．The homeowner doesn’t want to bother.
单项选择题
A．The need to exercise the memory.B．How the brain differs from other body tissues.C．The unconscious learning of a physical activity.D．How nerves control body movement.
A．The need to exercise the memory.
B．How the brain differs from other body tissues.
C．The unconscious learning of a physical activity.
D．How nerves control body movement.
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