单项选择题

______ both sides accept the agreement ______ a lasting peace be established in this region.

A. Only if, will
B. If only, would
C. Should, will
D. Unless, would
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单项选择题
According to the passage people who have experienced ups and downs may become ______.
A. nervous when faced with difficulties
B. physically and mentally strained
C. more capable of coping with adversity
D. indifferent toward what happens to them
单项选择题
The immediate cause of the fire is ______.
A. the wind
B. some embers
C. the explosion of the fuel tank
D. the materials of the roof
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