单项选择题

What were the villagers doing when the explosion occurred

A．They were celebrating a festival.
B．They were doing experiments.
C．They were working in the factory.
D．They were idling in the street.
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单项选择题
A long-term study of 136 pairs of twins showed that ______.
A．they lost a little ability to reason over the years
B．the only factor which declined over the years was their speed with which to perform mental tasks
C．their memory was not as good as it had once been
D．their minds became a bit more active as they grew older
单项选择题
Which of the following is NOT mentioned as one of the penalties
A．A fine.
B．Expulsion,
C．A jail term.
D．Death sentence,
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