请根据下面的实验过程给图排序，将其序号填入第66 ～69空格中，并完成第70小题。Do the experiment as follows ：【小题1】Put a short (0

请根据下面的实验过程给图排序，将其序号填入第66 ～69空格中，并完成第70小题。Do the experiment as follows ：
【小题1】 Put a short (0. 5 meter) board on two books. The books should be under the center of the board.
【小题2】 Ask your partner to stand on one end. With your hands ， push down on the other end. Can you lift your partner?
【小题3】 Put a longer (1 meter) board on the books. The end should be about 30cm from the books. Have your partner stand on the end that's near the books. Can you lift your partner?
【小题4】 Now do the same with the longest (2 meters) board. The end should be half a meter from the books. What will happen? Yes ！ You can lift your partner easily ！

【小题5】What experiment is it?A．A chemistry experiment.B．A physics experiment.C．A math experiment.D．A medical experiment.B

(答案→)B 解析：【小题1】B 根据文中提到Put a short (0. 5 meter) board on two books. The books should be under the center of the board.往两本书上放一个0.5米的板，书至于板的中央，故选B项。【小题2】D 根据文中提到Ask your partner to stand on one end. With your hands ， push down on the other end. Can you lift your partner，要求你的同伴站在板的一端，用你的手能翘你的同伴吗？，故选D项。【小题3】C 根据文中提到Put a longer (1 meter) board on the books. The end should be about 30cm from the books. Have your partner stand on the end that's near the books. Can you lift your partner，放一个1米长的板在书上，末端离书30厘米，同伴离书较近，你能翘起他吗，故选C项。【小题4】A 根据文中提到Now do the same with the longest (2 meters) board. The end should be half a meter from the books. What will happen? Yes ！ You can lift your partner easily，一个两米长的板，站在离书半米的地方，看你能不能翘起他呢。故选A项。【小题5】B 题目中问这个什么样的实验，这是个物理实验，故选B项。

我明天再问问老师，叫他解释下这个问题