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单项选择题

What does Mr. Pitt NOT do in his spare time

A．Doing a bit of acting and photography.
B．Going to concerts frequently.
C．Playing traditional jazz and folk music.
D．Travelling in Europe by hitch-hiking.
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单项选择题Which of the following is true according to the old view of memory

A．The neurons used to build the memory are a depletable resource.
B．The reason of memory loss as one grows older is that the neurons are worn out with the increase of age.
C．New memories do not need the supply of new neurons in the brain.
D．All of above.

单项选择题Around how many tons of hazardous waste does the world produce each year

A．150 million.
B．1.50 million.
C．15 million.
D．50 million.