题目内容

It is these poisonous products ______can cause the symptom of the flu, such as the headache and aching muscles.
A．whoB．thatC．howD．what
B

试题分析：考查强调句：强调句的结构是it is/was+强调部分+that....，强调的是：these poisonous products，句意：是这些有毒的产品导致了流感的症状,比如头疼和肌肉酸痛。选B。
点评：强调句型在高考中是出现频率很高的考点，关键是要会判断，平时练习时要有这个意识。it is /was+被强调部分+that/who+…判断方法是去掉it is /was  that/who句子不缺成分，即为强调句型。
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