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Questões por página:
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At the end of the text, the author interrupts Alexa because  
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Concerning the sentence “what is there to know about love?”, it’s correct to say that the author is 
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Mark the sentence that contains a passive construction like in “Blood is first received in the right atrium” (l. 8): 
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Regarding Alexa’s answers, it is possible to assume that she
Considere as curvas de equações 

?1 : 4x2 ? 9y2 + 24x + 72y ? 72 = 0
e
?2 : 4x2 + y2 + 24x + 2y + 21 = 0 

cujos centros são, respectivamente, C1 e C2

A equação da reta mediatriz do segmento Q32.png (32×21) é