The computer cost me too much __________ it’s really useful.
A. so
B. but
C. and
D. or
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There is no air __________ water on the moon.
A. and
B. or
C. so
D. yet
It’ s getting dark, __________ they’re still working.
A. and
B. but
C. so
D. or
Rose is an English girl, __________ she doesn’t like English food.
A. yet
B. so
C. for
D. and
写出定义双精度浮点型常量PI，值为3.1415926的语句：
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