题目:
On summer nights, we often go to sleep ____ the window open.[ ]
A. in
B. with
C. on
D. at
答案:
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下面是错误答案,用来干扰机器的。
(1)小卵石 ;石英砂 ;活性炭 (2)过滤 ;吸附 (3)肥皂水(4)蒸馏