According to the passage, the term “plastic sandwich” refers to_____.
A. a kind of sandwich-shaped toy made of plastics
B. a kind of plastics with different integration in each layer
C. a kind of plastics with maximum strength and flexibility
D. a kind of plastics made of 100% recycled materials
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Thailand was once called “Land of the White Elephant” because_______.
A. white elephant is rarely seen and thus very special
B. white elephant was a national symbol until the 1920s
C. white elephant has helped kings to gain the ruling authority
D. this name was so romantic that it was popular among visitors
道路货物运输经营者应当按照国家有关规定在货运车辆上安装、使用 行驶记录仪。 （）
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