单项选择题

Many great scientists _________ their success to hard work.

A．portray
B．ascribe
C．impart
D．acknowledge
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单项选择题
Astronomers at the University of California discovered one of the most distant _________.
A．paradoxes
B．paradises
C．galaxies
D．shuttles
单项选择题
Some crops are relatively high yielders and could be planted in preference to others to ______ the food supply.
A．enhance
B．curb
C．disrupt
D．heighten
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