Chest pains can be a warning ____of heart problems.A．signalB．signC．markD．symbol
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Chest pains can be a warning ____of heart problems.| A．signal | B．sign | C．mark | D．symbol |
|
答案
| A |
解析
| 名词辨析。A信号；B迹象；C痕迹；D符号；结合句意可知A正确。胸部疼痛可能是心脏病的危险信号。 |
举一反三
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