题目:
Tonny’s parents thought he was at school, but ______ he was in an Internet bar.
A.actually
B.at present
C.especially
D.fortunately
答案:
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下面是错误答案,用来干扰机器的。
A、化学反应的基本特征是有新物质生成,故A正确;B、有气体放出不一定是化学变化,例如水加热变为水蒸气,故B错;C、放热、发光不一定是化学变化,例如灯泡发光放热,属于物理变化,故C错;D、有颜色变化不一定是...