圆C1:(x+1)2+(y+1)2=4与圆C2:(x﹣2)2+(y﹣1)2=4的公切线有且仅有( )
A:1条
B:2条
C:3条
D:4条
While ____ the dog, you were careless and it got ____ and was hit by a car.
“荞麦铪烙面”味美营养,已上《舌尖上的鹰城》栏目,下列用到的食材中富含蛋白质的是( )