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

試題分析：考查強調(diào)句：強調(diào)句的結(jié)構(gòu)是it is/was+強調(diào)部分+that....，強調(diào)的是：these poisonous products，句意：是這些有毒的產(chǎn)品導致了流感的癥狀,比如頭疼和肌肉酸痛。選B。
點評：強調(diào)句型在高考中是出現(xiàn)頻率很高的考點，關鍵是要會判斷，平時練習時要有這個意識。it is /was+被強調(diào)部分+that/who+…判斷方法是去掉it is /was  that/who句子不缺成分，即為強調(diào)句型。
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