题目

Creating a good study environment takes a little planning. It is well worth the time as the end result will be much productive study time. Many people fail to do this and wonder why they cannot concentrate. After a couple of times of studying the right way, most people will be surprised at how much they can actually enjoy studying.  16  Know that concentration is the key. Reduce every possible distraction. Turn off the television and go in an area where you will not be interrupted by people.  17  If you are studying on your computer-don't get distracted by emails.      18   I如图甲所示的电路中，当开关闭合时，两灯泡都发光，两个电流表的指针所指位置均如图乙所示，则通过灯L2中的电流是A，两个灯泡中，电阻较大的是灯，发光较亮的是灯 ．