单项选择题

If you think a letter is too slow, why not try（）a telegram

A. to have sent
B. to send
C. to be sending
D. sending

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单项选择题

What would be the best title for this text（）

A．Living Longer or Not
B．Science, Technology and Long Living
C．No Limit for Human Life
D．Healthy Lifestyle and Long Living

单项选择题

Donald Louria’s attitude towards long living is that（）

A．people can live from 120 to 180
B．it is still doubtful how long humans can live
C．the human body is designed to last past about 120 years
D．it is possible for humans to live longer in the future