As we all know, _________ exercise will help to strengthen the heart and improve circulation of the blood.
A．normalB．a(chǎn)verageC．regularD．ordinary
C
句意：眾所周知，定期的鍛煉有助于增強(qiáng)心臟，促進(jìn)血液循環(huán)。 regular 定期的，有規(guī)律的。故選C。
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