单项选择题

Millions of tons of water are ______ by a complex system of dykes.

A．held up
B．held on
C．held out
D．held back
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单项选择题
The food was divided ______ according to the age and size of the child.
A．equally
B．individually
C．sufficiently
D．proportionally
单项选择题
The problem of pollution as well as several other issues is going to be discussed when the Congress is in ______ again next spring.
A．convention
B．conference
C．session
D．assembly
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