根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Don'tyou just love ice skating every winter? I am sure that since winter isapproaching, your skates are set to come out, just waiting to be used. Impressyour friends with a new trick on how to iceskate backwards with the help ofthese trips.
Stand straight
The first thing that you need to do is standstraight.____， if you feel that you are falling backwards. Don't worry；this happens to all.
Confidence is what you need
Themost important step while learning how to skate backwards is having enoughconfidence in yourself and in what you are doing. How can you achieve this? Bypractice. One of the important ice skating tips and techniques is that if youfeel that you are losing your balance, then scissor (做剪式运动) your skates____.
Maintain speed
Try sculling with one skate while rolling in astraight line with the
other____.Now bring the skate which you are using to scull, and then again,repeat the same process. Make sure that you put most of your weight on theskate which is moving straight and not the one with which you are sculling.Now, try the same thing using the other foot.
____
Once you are confident that you can scull witheither foot, the next thing that you have to do is increase your speed. Trysome of your own tricks now. Scull with either foot or with both at the sametime.
Scull and be aware
While you keep one foot straight, keepsculling with the other. You can do that with both feet at the same time.____，but don't get so involved that you don't see where you are going. If you arenot watching your back, you might just bang into something or someone.
A．That is, keep pushing yourself backwards with an outwardstroke(滑动)
B．While going backwards, just get used to the feeling ofmoving backwards
C．Keep practicing this till you are confident about it
D．Increase your speed now
E．One must be brave enough to learn to iceskate backwards
F．Concentrate on what you are doing
G．Just put your chin up and slightly bend your knees
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，则
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的示数如乙图所示，通过灯L的电流为 
