假如你是高中生李华，最近英语课上你们班对“绿色上学”活动进行了一次讨论，倡导大家骑自行车上学。请根据以下信息写一篇英语作文，并发表你自己的看法。
词数：100左右。
参考词汇：低碳生活low-carbon life节能的energy-saving

支持者观点	1.汽车带来了空气污染和交通堵塞等问题；
	2.骑自行车的益处：节能环保、有益健康等。
反对者观点	骑自行车上学浪费时间且不安全。

 
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语法填空

Amsterdam 【小题1】 (call) the “City of Bicycles” because of the convenience of riding bicycles there. In the 1960s, a group of cycling fans had 【小题2】 idea that it would be better for everybody if cars weren't allowed in the city centre and only bicycles were. They were 【小题3】 (hope) that this would help to save energy, reduce 【小题4】 (pollute) and provide free public transport. The group painted hundreds of bicycles white and placed them in lots of neighbourhoods around Amsterdam for people to use.

【小题5】 (fortunate), it didn't work because 【小题6】 (thief) took all the bicycles within weeks! However, more than thirty years later, the “white bike” is back in town — this time with a computer chip to record its every move!【小题7】 (take) a bicycle, you have to insert a special card. People who want to use the bikes 【小题8】 (park) at special parking places have to take them to another special parking place 【小题9】 has enough room. Thanks to the good ideas of lots of people, many people around the world have been enjoying city center streets 【小题10】 cars for many years.

   Today, we drive safer cars on safer roads, but most car accidents are the result of human error. 【小题1】 So it’s a good idea to review some basic rules for safe driving. Here are four driving tips that will help bring you and your passengers home unharmed.

1. Practice defensive（保护的）driving.

Defensive driving includes keeping a safe distance and not speeding. 【小题2】 Accept small delays, such as staying in line behind a slower car instead of suddenly changing lanes.

2. 【小题3】

Sometimes, it doesn’t matter how safely you drive. You are driving at the speed limit and obeying all traffic rules but someone else can crash into you. One good rule is to think everyone else on the road is a fool and be prepared for anything unexpected. 【小题4】 And it pays to be ready when you do.

3. Don’t follow too closely.

Drivers need enough time to react if the car in front makes a sudden turn or stop. It can be too difficult for drivers to judge the proper distances while driving and the exact distance is adjusted by speed, so most experts suggest a “three-second rule”.

4. Be more careful in bad weather.

【小题5】 Drive below the speed limit if necessary, keep extra space between you and the car ahead, and be especially careful around curves. If the weather worsens, just find a safe place to wait out the storm.

A．Wear your safety belt.

B．Watch out for other drivers.

C．Chances are that you’ll eventually meet someone foolish.

D．The best way to reduce accidents is to practice safe driving behaviors.

E．If you’re driving through fog, heavy rain or on icy roads, be extra careful.

F．Remaining calm in the face of annoying traffic is another major part of the idea.

G．If a driver is tired enough to fall asleep while driving, the results are terrible.

   With an improved economy，many travelers have been buying first or business class seats，leaving fewer for upgrades（升级）.Here are some strategies for getting a free upgrade.

1. Fly a lot.

This is the most common way to earn a free upgrade. Most airlines reserve some spaces for travelers who fly at least 5，000 miles per year. Five years ago，this meant half or more of domestic（国内的）first class travelers sat up front for free. But now，airlines are selling more high-price seats，so on popular routes it is not unusual for more than 20 travelers to compete for one or two upgrades. But on routes with fewer business class travelers，free upgrades remain more plentiful.

2. Use miles.

If you're not a frequent traveler but still have some miles to fly，you may be able to use them for an upgrade. Be careful，though，as many airlines now ask not just for miles but also a cash co-pay. One example: on flights to Europe，American Airlines charges 5，000 miles，plus $110，for a one-way upgrade from discounted economy class to business class. For most domestic upgrades，American Airlines wants 15，000 miles plus $ 75.

3. Get lucky.

Sometimes airlines overbook coach（经济舱），and a few travelers get no seats. Agents try to ensure the airline's most loyal travelers get the nod（被选中）. Agents usually have some flexibility to make sure the plane is full and takes off on time. So it's the easiest way for them to do it-they might upgrade someone else out of order.

4. Save a life.

Flight attendants don't usually upgrade passengers, even when empty seats remain. Doctors and nurses who answer an emergency call are sometimes an exception. If they comfort a passenger, flight attendants might allow them to sit in business or first class for the rest of the flight.

【小题1】What might be the main topic of the passage?

A．The ways to get upgraded on a plane.

B．How to get on the flight safely and on time.

C．The best ways to get free flight tickets.

D．How to save a life on a plane quickly.

【小题2】Who can have the chance to get a free upgrade?

A．The person who always obeys the rules on the flight.

B．The person who doesn't have to look after a patient.

C．The person who is a friend of the flight attendants.

D．The person who flies a lot and has a long flying distance.

【小题3】Why might medical personnel be allowed to sit in business or first class sometimes?

A．Because they would like to talk with flight attendants kindly.

B．Because they want to have a better rest after a long journey.

C．Because they need to treat a passenger who is in emergent condition.

D．Because they are tired of staying with common passengers.

【小题4】Where can we find the passage?

A．A life guide.	B．A travel guide.
C．A shopping guide.	D．A pilot guide.