—Would you like to go shopping with me? ———Yes, .
A:I would
B:I'd love to
C:that's all right
D:you are welcome
甲、乙两昆虫,甲的翅膀每分钟振动480次,乙的翅膀每秒钟振动300次,人凭听觉能感觉到在飞行的昆虫是( )
已知关于x的方程kx2+(1﹣k)x﹣1=0,下列说法正确的是( )