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【单选题】
What was the serious problem after the cane toads arrival in Australia?A.
The cane toads did not eat the cane beetles.
B.
The number of the cane toads had swollen.
C.
There was another outbreak of the cane beetles.
D.
The cane toads killed all the cane beetles.
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【简答题】A．The density of the water droplets in the air. B．The size of the water droplets. C．The temperature of the water droplets. D．The purity of the water vapor.
【单选题】All the _________ things need air and water. Without air or water, nothing can stay _______.
A.
living; living
B.
living; alive
C.
alive; alive
D.
alive; living
【简答题】[A]air[B]water [C]rest [D]warmth
【简答题】[A] air [B]water [C] rest [D]warmth
【单选题】The water cycle refers to the constant movement of water from land to sea to air and back again.
A.
Y
B.
N
C.
NG
【简答题】Air is to man what fish to water.
【简答题】The water circle refers to the ______ of water from land to sea to air and back again.
【单选题】The purpose of an air compressor unloading device is to _____.
A.
drain water from the air receiver
B.
drain water from the cylinders
C.
delay the compression process until the motor is up to speed
D.
check pump alignment
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