问题
选择题
In our class, when the bell rang and the teacher closed his book, it was a for everyone to stand up.
A．signal
B．chance
C．mark
D．measure
答案
答案：A
题目分析：signal信号；chance机会；mark标志；measure测量。句意是在我们课堂上，当铃声响起，老师合起课本时，这是让每个人都起立的信号。故选A。
点评：此题是名词词义辨析，所给词都是常见词，弄清题意就很容易选择。