单项选择题

The salmon spends its adult life in rivers and seas, but ______ .

A．its eggs are laid in streams
B．it lays its eggs in streams
C．in streams are laid its eggs
D．laid in streams are the eggs
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单项选择题
It is desirable that the airplane ______ as light and fast as possible.
A．be made
B．is made
C．were made
D．has been made
单项选择题
On the memorable occasion, the soldiers ______ the Colonel when he arrived.
A．shouted
B．solved
C．salvaged
D．saluted
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