伟晶岩矿床是某些稀有元素和稀土元素矿产的重要来源。()
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The idea of flying car is mentioned to illustrate______.
A. a common perception of technology as characterizing the future
B. a failed goal amid overwhelming technological success
C. a goal that will be achieved in the future through technology
D. the flawed vision of the future that many people held and some continue to hold
In the text, the "Dark Age of the Universe" refers to______.
A. the formation of the first stars
B. a period during which black holes were prominent
C. a period following the big bang
D. the time before the universe began
Using the Internet has helped the transportation industry______.
A. communicate more efficiently with their customers
B. communicate with suppliers
C. reduce costs
D. reduce the gross domestic product
Which of the following would be the best title for the text？
A. People have bias over stress
B. The upside of stress, long ignored but true
C. The mechanism of posttraumatic growth
D. Stress" s harm to people" s health
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