单项选择题

One explanation given by scientists for the crop circles is that they are made by ______.

A．airplane crashes
B．air movement
C．unknown flying objects
D．new farming techniques
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单项选择题
According to Friendly Advice , what should parents do to prevent their children from drinking or smoking
A．Do researches on drinking and smoking habits
B．Take advice from their children's friends
C．Put more pressure on boys than on girls
D．Talk with their children like friends
单项选择题
According to the text, a hoax ( line 1, para. 3 ) is probably ______.
A．an attempt made to fool people
B．a special way to plant crops
C．an experiment for the protection of crops
D．a research on the force of winds
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