题目内容

The first thing you need to do is to find the terminal building for your flight.

A. 对
B. 错

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After you get your boarding pass and check your baggage, you can board the plane.

A. 对
B. 错

1.5 取消机票-进阶-对话-段落翻译Jean Carver's reservation from Beijing to Dali is cancelled because she did not call Air China to confirm her reservation 24 hours before the flight departure. As a result , she has to take a next day flight.

甲苯中的甲基是邻对位定位基，然而三氟甲基苯中的三氟甲基是间位定位基，请解释。

在室温下，甲苯与浓硫酸作用，生成约95%的邻和对甲苯磺酸的混合物。但在150~200 °C较长时间反应，则生成间位(主要产物)和对位的混合物。试解释之(提示:间甲苯磺酸是最稳定的异构体)。