单项选择题

They claimed that they did not arrange the demonstration. It was absolutely _______.

A．spontaneous
B．simultaneous
C．synthetic
D．substantial
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单项选择题
The investigators ______ for lunch.
A．process
B．excess
C．recess
D．access
单项选择题
Some crops are relatively high yielders and could be planted in preference to others to ______ the food supply.
A．enhance
B．curb
C．disrupt
D．heighten
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