单项选择题

Our school singing group is going to give ______ performance next month; don't miss it.

A．an alive
B．a living
C．a live
D．a life
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单项选择题
The energy gained-from the sun can then be used during the night to enable the necessary chemical reactions to ______ in his body.
A．precede
B．proceed
C．progress
D．practice
单项选择题
Caracas has been called the Los Angles of South America; at ______ they look exactly the same.
A．short notice
B．first sight
C．first impression
D．first appearance
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