单项选择题
A.Quit smoking. B.Loose weight. C.Have a talk with the doctor. D.Weigh himself frequently.
A.We can do without railways. B.Trains have much in common with motorcars and planes. C.Motorcars and planes are not as good as trains. D.Trains are as good as motorcars and planes.
A.Someone spilled water on it. B.Someone lost it. C.It was made of low quality metal. D.The standard for measuring had changed.