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【简答题】
Choose the correct words in the box for the pictures and then fill in the blanks below. light bulb; electric wires ; power stations ; cables; wires and cables 1. Electricity is produced in ____________(1)__________________. 2. ______(2)_________ underground are connected to power stations. 3. Thin ______________(3)_______________ are connected to cables. 4. Our electrical appliances are connected to __________(4)_____________. 5. Electricity comes into our houses by flowing through _______(5)_______ and cables from __________________(6)___________________.
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【单选题】在加工球面时，只要使铣刀旋转时刀尖运动的轨迹与球面的截形圆重合，同时工件绕其自身轴线转动，并且铣刀旋转轴线与工件的旋转轴线（），这两种运动配合铣削就能加工出符合要求的球面。
A.
垂直
B.
平行
C.
相交任意点
D.
相交于球心
【单选题】This is _____ third year that China has taken part in the activity Earth Hour. But we hope we can try our best to make the earth ____better world.
A.
the; a
B.
a; the
C.
the; /
D.
the; the