单项选择题

Man closes his eyes quickly when a fly suddenly rushes to his face. We call it the ______ reaction of human being.

A．voluntary
B．stern
C．intrinsic
D．natural
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单项选择题
All visitors are requested to______ with the regulations drawn up months ago.
A．comply
B．agree
C．assist
D．consent
单项选择题
The police must have a search______ to search a house, otherwise their search will be considered as illegal intrusion.
A．certificate
B．guarantee
C．license
D．warrant
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