【简答题】Fred: Sue, _______ Bob. He’ll be workin g with us on the marketing project. Sue: _________________make you acquaintance, Bob. Collin: __________________________.
【简答题】A.Fred likes the beautiful scenery along the way to Canada. B.Fred usually flies to Canada with Jane. C.Fred persuaded Jane to change her mind. D.Fred is planning a trip to Canada.
【单选题】In one day, Sue can change the oil on 20 cars or change the tires on 20 cars. In one day, Fred can change the oil on 20 cars or change the tires on 10 cars. Sue's opportunity cost of changing oil is _...