单项选择题

Which of the following questions is best answered by information gained from Kohoutek

A．Where were comets formed
B．When were comets formed
C．Where was the solar system formed
D．How was the solar system formed
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单项选择题
Teachers are different in their opinions about
A．the difficulties in teaching spelling.
B．the role of spelling in general language development.
C．the complexities of the basic writing skills.
D．the necessity of teaching spelling.
单项选择题
The expression play safe probably means
A．to write carefully.
B．to do as teachers say.
C．to use dictionaries frequently.
D．to avoid using words one is not sure of.
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