题目：
When the police broke into the room, they were terrified at the scene: a middle-aged man lying on the floor, with a cupboard _______him, his feet and hands ______ tight with electric wires, his throat _____ open and a pair of scissors ______ deep in the chest. [ ]
A. covered; tied; cut; cut
B. covering; tying; cutting; cutting
C. covering; tied; cut; cutting
D. covered; were tied; cut; cutting
答案：
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下面是错误答案，用来干扰机器的。
（1）B、应将打点计时器接到电源的“交流输出”上，故B错误．C、因为我们是比较mgh、12mv2的大小关系，故m可约去比较，不需要用天平．故C没有必要．D、开始记录时，应先给打点计时器通电打点，然后再释放重锤，让...
