问题
选择题
It is difficult for any of us to eat better, exercise more and sleep enough _________ we know we should.
A．despite
B．even though
C．as if
D．unless
答案
答案：B
考查词性词义：A. despite介词，虽然，B. even though连词，既然，C. as if 连词，好像，D. unless连词；除非，句意是：我们每个人想吃得好，多锻炼，睡眠足够都很难，即使我们知道应该这么做。选B。A的词性不对。