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【单选题】
下列物质属于纯净物的是 [ ]A.
河水
B.
液氧
C.
煤
D.
纯净的空气
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反馈参考答案：
举一反三
【简答题】内桥接线适用于情况；外桥接线适用于情况。
【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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