单项选择题

A neutron is so tiny that it would take ten trillion of them to cover a square inch.

A．indefinite
B．variable
C．minuscule
D．intangible
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单项选择题
The plane for Riode Janeiro will take off at 6.00 p. m.
A．depart
B．land
C．approach
D．refuel
单项选择题
Canada does not have a state religion, and the separation of church and state has been firmly upheld.
A．officially
B．formally
C．easily
D．solidly
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