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

双能源（汽油和天然气）汽车以其经济、污染小等优点备受人们的青睐，已知天然气的热值是7×10⁷J/m³，则气缸内完全燃烧0.1m³天然气，释放出　____ J热量，我们能听见汽车的鸣笛声，人耳能听见的声音频率范围是　____ Hz．

阅读下面短文，从A、B、C、D四个选项中选出最佳选项。

    Compared with other European countries, lifestyle in Italy is slower and more relaxing in its own way. Italians love to chat over a cup of coffee, go out for a walk in the middle of the day, and enjoy long lunches and dinners.

    The family is important to Italians. They can't think of spending a day without talking about their parents and children, or a weekend without a family lunch or dinner. Italians living outside their country miss their family a lot.

    Italians like simple life. Their days start and end with a cup of coffee. A cup of coffee after every meal is a must. Italians love to spend time over a hot cup of coffee and even hotter conversation with friends. Topics are usually about family, football and politics(政治).

    Sport is a very important part in lives of many Italians. Football is their favorite sport. There are hundreds of football clubs with top football teams in Italy. Also, many top players from all over the world play in Italy. Volleyball is also popular and so is rugby, with the top rugby team playing for the European Challenge Cup.

Every Italian province, city, town and street has a historical event that took place there and the Italian calendar is filled with national holidays that they love to celebrate.