单项选择题

Mathematics is the instrument used by the physical sciences to __________ phenomena and record conclusion.

A．expel
B．expire
C．exploit
D．explore
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单项选择题
The most complex,__________ and powerful communications satellite ever developed, ATS -6 was used this year to transmit educational television programs to students in the Rocky Mountain areas.
A．vertical
B．versatile
C．verdict
D．verbal
单项选择题
A Pan American Boeing 707 approaching Bali's international airport __________ into a mountain on April 22, killing all 107 persons on board.
A．smashed
B．fractured
C．cracked
D．shattered
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