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．A television.B．A washing machine.C．A computer.D．A fridge.
A．A television.
B．A washing machine.
C．A computer.
D．A fridge.
单项选择题
A．Because they ail work very hard.B．Because their teachers are all native speakers of English.C．Because they learn not only in class but also out of class.D．Because they are all advanced students.
A．Because they ail work very hard.
B．Because their teachers are all native speakers of English.
C．Because they learn not only in class but also out of class.
D．Because they are all advanced students.
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