单项选择题

All matter is made up of atoms; _______, it is made up of nuclei with electrons whirling around them.

A．that is
B．on the contrary
C．in short
D．on the other hand
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单项选择题
A budget of five dollars a day is totally _______ for a trip round Europe.
A．inadequate
B．incapable
C．incompatible
D．invalid
单项选择题
Over the last fifteen years, running has become a popular _______ for 30 million participants of all ages.
A．fantasy
B．pastime
C．symposium
D．penalty
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