We can do a lot to stay healthy.         , we should eat a balanced diet.
A. At a time           B. In fact          C. First of all
C
介詞辨析。A每次；B事實(shí)上；D首先；結(jié)合句意可知C正確。句意：為了保持健康，我們能做很多事情，首先，我們應(yīng)該有平衡的飲食。
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