题目

Drivers who drive a little too close to cyclists on the road could soon be caught on the spot. A new technology adopted by legal departments in Ottawa could help carry out legal distance between bikers and cars on the road.The device, which is fixed on a bicycle’s handlebars like a bike bell, uses sonar(声呐) technology to measure the distance between the bike and passing cars. The device will make a loud noise if the car is within one meter of the bike, the legal limit in the city of Ottawa, allowing the police rider to radio ahead to his colleagues so that the driver can be pulled over. 我国领土陆地面积约为________万平方千米，居世界第________位；海岸线长为________千米，陆地国界线长为________千米．