A:验钞机
B:感应干手机
C:日光灯
D:医用灭菌灯
While ____ the dog, you were careless and it got ____ and was hit by a car.
下图为30°N附近海平面某月气压示意图(单位:hPa)。读图回答下列问题。
下列对水螅的描述.不正确的是( )