单项选择题

A．Having fun while in school.
B．Working toward long-range goal.
C．Being discouraged.
D．Dropping a class that is dull and boring.
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单项选择题
A．Because it was one of the first tools.B．Because it developed human capacities.C．Because it led to the invention of machines.D．Because it was crucial to the development of mankind.
A．Because it was one of the first tools.
B．Because it developed human capacities.
C．Because it led to the invention of machines.
D．Because it was crucial to the development of mankind.
单项选择题
A．Greenhouse gases.B．Over-exploitation of the beach.C．Change of agricultural zones.D．Change of climates.
A．Greenhouse gases.
B．Over-exploitation of the beach.
C．Change of agricultural zones.
D．Change of climates.
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