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单项选择题
A．It works on wet surfaces.B．It’s stronger than synthetic glue.C．It’s a nutritious source of protein.D．It has been used successfully by doctors.
A．It works on wet surfaces.
B．It’s stronger than synthetic glue.
C．It’s a nutritious source of protein.
D．It has been used successfully by doctors.
单项选择题
A．Make posters.B．Write a speech.C．Answer questions.D．Study chemistry.
A．Make posters.
B．Write a speech.
C．Answer questions.
D．Study chemistry.
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