单选题
On entering the laboratory, Mr Abu was immediately suspicious because ______.
A、
the whole class was looking so innocent
B、
he was a suspicious man by nature
C、
there was no teacher in the room
D、
he could smell chemicals and he knew it was a physics lesson
【正确答案】
A
【答案解析】
从最后一段内容可以知道，Mr．Abu一走进实验室，首先观察的是学生的表情，他们一脸无辜的样子引起了他的怀疑，然后他才闻空气的味道。
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