I can't stand swimming in cold rivers in winter．
But it's ______ for your health．You know I often swim in rivers in different seasons．（ ）
A．helpfulB．harmfulC．painfulD．careful
I can't stand swimming in cold rivers in winter．
But it's ______ for your health．You know I often swim in rivers in different seasons．（ ）
A．helpfulB．harmfulC．painfulD．careful
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