单项选择题

A．Because the Earth is heavily polluted.
B．Because nature cannot recycle its resources.
C．Because there are more and more people living on the Earth.
D．Because no more new resources can be added.
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单项选择题
A．He was a brave soldier.B．He took war photographs.C．He painted portraits.D．He designed a portable camera.
A．He was a brave soldier.
B．He took war photographs.
C．He painted portraits.
D．He designed a portable camera.
单项选择题
A．You can just sit at home and read about it.B．You can not learn a language from the rules only:C．You must learn very complicated rules in language learning.D．You can just go to class, study and do your homework.
A．You can just sit at home and read about it.
B．You can not learn a language from the rules only:
C．You must learn very complicated rules in language learning.
D．You can just go to class, study and do your homework.
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