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【单选题】
已知点M（x，y）的坐标满足不等式组 此不等式组确定的平面区域的面积为12，则a的值为 [ ]A.
2
B.
4
C.
6
D.
8
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【简答题】为什么虞世南被称为三朝五代元老?
【单选题】After that air accident, no one in the place _________. [ ]
A.
left
B.
survived
C.
went
D.
keep
【单选题】Air and water __ are still serious problems in many developing countries. [ ]
A.
pollution
B.
accident
C.
development
D.
height
【单选题】There was an air crash in Xi'an, the pilot didn't __________ the accident. [ ]
A.
survive from
B.
survive in
C.
survive of
D.
survive
【单选题】According to the passage, if an air plane has an accident-free record, it usually pays to the insurance company ______.
A.
a large premium
B.
less premium
C.
no premium
D.
the same premium as the other companies
【单选题】If he ______ more carefully, that accident _______ and he _______ . [ ]
A.
were driving; wouldn’t happen; wouldn’t die
B.
had driven; wouldn’t have happened; wouldn’t die
C.
had driven; wouldn’t have happened; wouldn’t have died
D.
should have driven; wouldn’t have been happened; wouldn’t have died
相关题目：
【单选题】After that air accident, no one in the place _________. [ ]
A.
left
B.
survived
C.
went
D.
keep