单项选择题
Cancer cells destroy not only all rival cells, in their
ruthless
biological warfare, but also destroy the larger organization—the body itself—signing their own suicide warrant.（）
A. refined
B. random
C. merciless
D. perpetual
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单项选择题
Long treatment of the elderly drains funds from the health needs of other groups and from urgent social problems.（）
A. restrains
B. detains
C. soars
D. exhausts
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