单项选择题
A neutron is so
tiny
that it would take ten trillion of them to cover a square inch.
A．indefinite
B．variable
C．minuscule
D．intangible
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单项选择题
There is always excitement at the Olympic Games when an athlete breaks a previous record of performance.
A. beats
B. matches
C. maintains
D. announces
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单项选择题
Talks on climate change resumed in the German city of Bonn on July 16 to combat global warming.
A. focus on
B. settle down
C. fight against
D. sum up
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