单项选择题

The dog has been of most value to man in the development of ______.

A．a treatment for rabies
B．open-heart surgery
C．a cure for distemper
D．Both A and C
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单项选择题
Why did George laugh at Anne's question
A．Because the students always wore evening dress.
B．Because it wasn't evening.
C．Because all the students wore evening dress in June.
D．Because he knew she had never seen formal dress worn in the morning before.
单项选择题
What does George mean by with their tutor, or teacher
A．Students have either a tutor or a teacher.
B．A tutor is not the same as a teacher.
C．Tutor is another word for teacher.
D．Students have a teacher as well as a tutor.
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