单选题
Until recently, body heat has caused problems because it ______.
A、
was difficult to collect
B、
came in a variety of forms
C、
was difficult to get rid of
D、
tended to be absorbed by physical objects
【正确答案】
C
【答案解析】
是开头的第二句：The Usual problem is how to dispose of it 。Dispose of“处理解决”。
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