单项选择题

A．Greenhouse gases.
B．Over-exploitation of the beach.
C．Change of agricultural zones.
D．Change of climates.
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单项选择题
A．She suggests the man scatter his money around.B．She suggests the man should save every of his pennies.C．She suggests the man should keep his waist belt tight.D．She suggests the man visit Tibet in the next summer vacation.
A．She suggests the man scatter his money around.
B．She suggests the man should save every of his pennies.
C．She suggests the man should keep his waist belt tight.
D．She suggests the man visit Tibet in the next summer vacation.
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.
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