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【多选题】
如图, L 1 、 L 2 为地月系统的两个拉格朗日点,卫星位于这两点时,会在地球引力与月 球引力的共同作用下,可以 几乎不消耗燃料而保持与月球同步绕地球做圆周运动。若 有两颗质量相同的卫星分别位于 L 1 、 L 2 ,则A.
在 L 2 处的卫星的角速度大于在 L 1 处的
B.
在 L 2 处的卫星的线速度大于在 L 1 处的
C.
在 L 2 处的卫星的向心加速度大于在 L 1 处的
D.
在 L 2 处的卫星受到的地球引力大于在 L 1 处的
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【简答题】A．They can not find a good math teacher. B．They can not pass the examination. C．They can not meet the requirements. D．They can not catch up with the lessons.
【简答题】A．They can tell people apart by how they behave. B．They can type each other. C．They can tell good people from bad ones. D．They can recognize human faces.
【单选题】What’s the main reason for Americans to go out to eat?
A.
They can meet with many friends.
B.
They can have cheaper food there.
C.
They can save time by not cooking.
D.
They can avoid washing dishes after the meal.
【简答题】A．They shine brightly. B．They are extremely strong. C．They can store heat. D．They can absorb water.
【简答题】A．They can buzz in to kill. B．They can hear the dry plants' cries. C．They can imitate the plants' crying. D．They can attack healthy plants in dry, hot weather.
【单选题】What can they do in the kitchen? [ ]
A.
They can cook the meals.
B.
I can sweep the floor.
C.
They can clean the bedroom.
【单选题】What can robots do in unpleasant surroundings?
A.
They can take the lunch breaks.
B.
They can have the vocation.
C.
They can work 24 hours a day.
D.
They can go on strike.
【简答题】A．They can share it with others. B．They can buy things they want. C．They can save it. D．All-above mentioned.
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