单项选择题

In the sweatshops in Britain during the Industrial Revolution, the laborers ______ day and night.

A．made to work
B．were made to work
C．were made work
D．were made working
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单项选择题
Which of the following is NOT discussed as an ability animals are thought to have
A．Selecting among choices.
B．Anticipating events to come.
C．Remembering past experiences.
D．Communicating emotions.
单项选择题
It can be inferred from the statement about mother chimpanzees and their young (lines 21—23) that young chimpanzees have difficulty ______.
A．communicating with their mothers
B．adding quantities
C．making choices
D．opening hard nuts
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