单项选择题

The basic causes are unknown, although certain conditions that may lead to cancer have been ______.

A．identified
B．guaranteed
C．notified
D．conveyed
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During the construction of skyscrapers, cranes are used to ______ building materials to the upper floors.
A．toss
B．tow
C．hoist
D．hurl
单项选择题
All the ceremonies at the 2000 Olympic Games had a unique Australian flavor, ______ of their multicultural communities.
A．noticeable
B．indicative
C．conspicuous
D．implicit
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