单项选择题

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．Repeat it aloud,B．Write it down.C．Make a mental picture of itD．Practice recalling it.
A．Repeat it aloud,
B．Write it down.
C．Make a mental picture of it
D．Practice recalling it.
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