每侧机翼有几个襟翼?
A、1
B、2
C、3
参考答案:B
舌的一定部位与一定的脏腑相联系,与舌尖有关的脏腑是()
A.淡白舌
B.淡红舌
C.绛舌
D.红舌
E.紫舌
Some scientists think there are _______ 2,000 million flashes of lightning per year.
A.in short
B.on average
C.as usual
D.in total