题目

阅读下面材料，在空白处填入1个合适的单词或括号内单词的正确形式。I wonder if it’s because I haven’t been able to be outdoor for so long 【1】I’ve grown so crazy about very everything 【2】 (do) with nature. I can well remember that there was【3】 time when a deep blue sky, the song of the birds, moonlight and flowers could never have kept me spellbound. That 【4】(change) since I was here.One evening when it was so warm, I stayed awake【5】 purpose until half past eleven in order to have a good look at the moon by 【6】. But as the moon gave far t下列关于化学键的叙述中正确的是（　　）A．离子化合物中只含离子键B．离子化合物中可能含共价键C．共价化合物中不含非极性键D．共价化合物中可能含离子键