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
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单项选择题
Yellow National Park's attractions include the. famous Old Faithful geyser, vast forests, ______ wildlife, and well-maintained campgrounds.
A．plentiful
B．generous.
C．liberal
D．extravagant
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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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them→it。
until。
firm。
clearly→clear。
rescue。