单项选择题

The author believes recent discoveries of the remains of complex societies in Amazonia（）

A.are evidence of early indigenous communities.
B.are the remains of settlements by invaders.
C.are the ruins of communities established since the European invasions.
D.show the region has only relatively recently been covered by forest.

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单项选择题

Human irritability may be influenced by（）

A.how nervous and aggressive people are.
B.reaction to certain weather phenomena.
C.the number of ions being generated by machines.
D.the attitude of people to thunderstorms.

单项选择题

The number of daylight hours（）

A.affects the performance of workers in restaurants.
B.influences animal feeding habits.
C.makes animals like hamsters more active.
D.prepares humans for having greater leisure time.