“They” in the second paragraph refers to _______.
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1 .Several countries in the world are using strong electromagnets ________.
A to develop a maglev train rail system. B to explain why maglev trains are faster. C to pull and push the train forward. D to create a magnetic field. E to experiment with the maglev train. F to travel from Paris to Rome in about two hours.
2 .You can connect a wire to the positive and negative ends of a battery __________.
A to develop a maglev train rail system. B to explain why maglev trains are faster. C to pull and push the train forward. D to create a magnetic field. E to experiment with the maglev train. F to travel from Paris to Rome in about two hours.
3 .A unique system of magnetic fields is created by the coils _______.
A to develop a maglev train rail system. B to explain why maglev trains are faster. C to pull and push the train forward. D to create a magnetic field. E to experiment with the maglev train. F to travel from Paris to Rome in about two hours.
4 .The frictionless maglev train enables you ___________.
A to develop a maglev train rail system. B to explain why maglev trains are faster. C to pull and push the train forward. D to create a magnetic field. E to experiment with the maglev train. F to travel from Paris to Rome in about two hours.
5 .Why mice are described in the passage as “creatures of the night“ because they are
A frightening to many people B hunted by birds C studied while in hibernation D active after dark
7 .David Lack’s research contributed to biological science specifically in the area of _______.
A Evolution B mating behavior C animal demography D immunology
8 .According to the passage, the ocean generally has more salt in _______.
A coastal areas B tropical areas C rainy areas D turbulent areas
9 .All of the followings are processes that decrease salinity EXCEPT _______.
A evaporation B precipitation C run off D melting
10 .Why does the author mention the Weddell Sea?
A to show that this body of water has salinity variations. B to compare Antarctic waters with Arctic waters. C to give an example of cold-water salinity. D to point out the location of deep waters.
