假定A商品的互补品价格上升10%时,该商品需求变动为20单位;当它的替代品价格下降10%时,A商品需求变动为30单位。如果其他条件不变,当上述两种情况同时出现时,A商品的需求数量
I prefer movies ______ scary monsters.
—Listen! Someone is singing in the next room. Who ____ it be? Is it Li Wei? —No, it ______ be her. She is at school now.
The hair band isn’t _______. It belongs to _______.
—What ____ cold weather! —Yes, But it’s ____ unusual experience for us. We normally live in a hot place.
—Which hobby do you think______ the least time? —Collecting stamps.