单项选择题

Questions 18～21 are based on the following dialogue on sports. What is the speaker’s main topic

A．Training for a professional athlete.
B．His physical training.
C．How to do cross-country running.
D．How to do mountain climbing.
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单项选择题
The animal source which provides the most protein for human being is ______.
A．beef
B．fish
C．pork
D．chicken
单项选择题
By saying Stevie soon graduated from toy instruments to real instruments , the author means that ______.
A．Stevie finished his study at a toy instruments school
B．Stevie began to study in a real instruments school
C．Stevie gave up ail his toy instruments and began to buy many real instruments
D．Stevie started to play real instruments
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