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【单选题】
下列有关元素及其化合物知识说法正确的是（ ）A.
浓硝酸能与木炭反应，证明浓硝酸既具有强氧化性又具有强酸性
B.
溴中溶有少量氯气，可用先加入少量溴化钠溶液再用酒精萃取的方法提纯
C.
高温下SiO 2 与Na 2 CO 3 生成Na 2 SiO 3 和CO 2 ，证明硅酸酸性强于碳酸
D.
铵盐受热都能分解，但不一定都能生成氨气电解
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反馈参考答案：
举一反三
【简答题】He says that by the end of next year he (plant) 2000 trees.
【简答题】内桥接线适用于情况；外桥接线适用于情况。
【简答题】He says by the end of next year he _____ (plant) 2000 trees.
【单选题】When the author says 'I gave up' at the end, he means ______.
A.
he gave up his belief in the moral idea of the hare-and-tortoise story
B.
he gave up arguing with Tony
C.
he gave up Tony as a hopeless child
D.
he gave up trying to keep up with the new generation
【单选题】When the writer says 'I gave up' at the end，he means ______.
A.
he gave up his belief in the moral idea of the hare and tortoise story
B.
he gave up arguing with Sonny
C.
he gave up Sonny as a hopeless child
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