单项选择题

We can infer that the author's attitude towards the outcome of the changes in Japan is likely to be one of______.

A．pessimism
B．optimism
C．criticism
D．cautiousness
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单项选择题
The crops' reception of the minimum of competition from other plants is necessary because______.
A．other plants competed with crops for sunlight and rain
B．people were farming in Asia, Africa and Europe
C．they could get rid of other plants
D．they wanted keep the biological balance
单项选择题
What does this refer to in the sentence This leaves gaps of bare soil... (Para. 4)
A．Cutting down trees and grasses and burning them.
B．The New Stone Age people's clearing of rain forest.
C．Planting of seeds in the bare soil.
D．This type of farming.
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