【单选题】【消耗次数：1】
The earth on[填空] we live is a planet.
①
which?
②
where
③
when
④
whose
参考答案：
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【单选题】
已知a=（3，1)，b=（x，-2），且a⊥b，则x的值为（ ）
①
<img src="20190823/1566540550755497.png" title="1566540550755497.png" alt="图片6.png" width="17" height="45"/>
②
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