一道选择题：
A light with no more power than______by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam.
A. that produced B. that is produced C.produced
这题选什么？请老师给出解题思路，谢谢！
期望老师再给出一些类似的题型的训练，这种题我总是错。
要做对这种题，重点还是培养“对称”感：
A light with no more power than the power that is produced by an ordinary electric light bulb becomes X 一道光束---带的能量比一只普通灯泡发出的能量----
=A lightwith no more power thanthe power thatis produced by an ordinary electric light bulb becomes X
= A lightwith no more power thanthe power produced by an ordinary electric light bulb becomes X
=A lightwith no more power thanthat produced by an ordinary electric light bulb becomes X
1. --A
2. no more power than 与...同样多的能量
