单项选择题

What was the cause of the explosion

A．Children playing with fire.
B．The setting off of fireworks in a house with explosives,
C．Sparks from a fireworks display falling on the warehouse,
D．The firing of a gun.

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热门试题

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

According to Dr. Jarvik's studies, middle-aged and older persons would expect to ______.

A．remember less
B．reason better
C．learn fewer things
D．lose no intellectual ability