loadingC．get rid of D．make use of
10．Sitting too much is dangerous because it can ______. A．make a person unable to exercise enough in a day B．destroy the balance of glucose and fat the body C．increase glucose and fat in the body D．make a person become lazy
11. In the opinion of Ekblom-Bak, when at work, you'd better have a rest by ________.
A．sending your friends e-mails B．taking a walk around your office
C．chatting online or playing computer games D．listening to music while sitting
12．Which of the following might be the best title for the passage? A．Side Effects of Sitting Too Much B．Don't Sit Too Much While Working C．More and More People Sit Too Much D．Sitting Too Much Could Be Dangerous
D
You may ride on your bicycle in a rush to get to school every morning. You may fight to get a bit of space on a bus or in the subway. You may also watch taxis crawl their way through traffic jams.
No matter where you are, all big cities around the world have traffic jams these days. But although they all have their problems, many cities also have a type of transport that has become a cultural icon (文化标识)．
In London to avoid the traffic above ground, people use the “underground”，also called the “tube”. The city has the oldest and most complicated underground railway system in the world and is the pride of many Londoners. With 12 lines and 275 stations across the city, the tube, is normally the quickest and easiest way of getting around London. In London, you are never far from a tube station.
New York is famous for its yellow cabs. They serve as a quick and easy way of getting across Manhattan, where the subway doesn't take you everywhere. Stopping a