单项选择题
May I have two（）instead of beans, please
A.corn's ear B.corn ears C.ear of corns D.ears of corn
单项选择题 Paul: Can I help with your luggage? Lisa:（）
单项选择题 The convenience of modern freeways, railways and airplanes makes travel in America as easy as （）
单项选择题 Henry Ford was himself a（）mechanic and could build a car with his own hands.
