题目内容
（请给出正确答案）
[主观题]
A long-term study of 136 pairs of twins showed that ______.A．they lost a little ability to
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
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