假定甲商品和乙商品是替代品,甲商品和丙商品是互补品。如果市场上甲商品的价格大幅度下降,那么在其他条件不变时:①乙商品的需求量减少 ②乙商品的需求量增加 ③丙商品的需求量减少 ④丙商品的需求量增加
Everybody knows that blind people shouldn't
I think _______is meaningful to help other people.
Great changes _______in our country since 1990.
- Have you seen the film Kongfu Panda? - No, but some of my friends_______.
She was the eldest _______the three girls.