单项选择题

A．

B．

C．

D．

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单项选择题

7.
A、People can be educated to be grateful.

B、Most people express gratitude for help.
C、Most people have bad days now and then.
D、People are ungrateful when in a bad mood.

单项选择题

假说，假设
A、hypothesis
B、hyperbole
C、hygiene
D、hypocrisy