单项选择题

The old sailor had never studied navigation, but he had good ________knowledge of it.

A．periodical
B．tropical
C．empirical
D．vertical
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单项选择题
Some children display an ________curiosity about every new thing they encounter.
A．incredible
B．infectious
C．incompatible
D．inaccessible
单项选择题
He had a (n) ________habit of emptying ash trays out of his upstairs window onto our doorstep.
A．disgusting
B．offensive
C．uneducated
D．offending
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