单项选择题
A．By going on a diet. B．By having fewer meals. C．By doing physical exercise. D．By eating fruit and vegetables.
A．Man will probably be able to live there in 200 years. B．Scientists are rather pessimistic about it. C．Man will probably be able to live there in 100,000 years’ time. D．Scientists are optimistic about overcoming the difficulties soon.
A．The deadline is drawing near. B．She can’t meet the deadline. C．She turned in the proposals today. D．They are two days ahead of time.