问题
单项选择题
Heat is always being transferred in one way or another, ______ there is any difference in temperature.
A．since
B．where
C．after
D．as soon as
答案
参考答案：B
解析：where在句中是连接副词，意为：“在……地方”。题句意为：“凡是有温差的地方，热都会以这样或那样的方式传导。”