题目内容：

Drink drivers could be prohibited from driving under the influence if new technology from Nissan is introduced.

The Japanese car maker has developed a new odor (气味) detection system designed to prevent drivers from operating a car if they are over the legal limit. The system works by using a series of sensors (传感器) to detect the level of alcohol the driver has consumed.

A high-sensitivity alcohol odor sensor is built into the gear stick (变速杆), which is able to detect the presence of the driver’s palm as he or she attempts to start driving. If the alcohol level detected is above a pre-determined limit, the system automatically locks the transmission(变速器), immobilizing the car. A voice alert is also issued via the car navigation system telling the driver that he or she is over the limit.

Extra sensors are also placed in the driver and passenger seats and a warning is issued if these sensors detect the presence of alcohol in the air inside the vehicle cabin.

While still in the developmental stage the concept of drink driving detectors being built into cars has generally been welcomed by many drivers.

Nissan said the technology is part of a project aimed at halving the number of fatalities (灾祸) and serious injuries in Nissan cars by 2015 compared to 2005 levels.

1.The detection system works _______________.

A．by detecting the smell of alcohol in the vehicle cabin

B．by measuring the volume of the alcohol in vehicle cabin

C．by detecting the weight of the school in the vehicle cabin

D．by using a car navigation system

2.What do we know about the detection system?

A．The detection system is still in the developmental stage.

B．The new technology from Nissan has been introduced.

C．The driving detectors are being built into cars.

D．The system has already been used in some car companies.

3.The driver’s attitude toward the detection system is that of _______________.

A．annoyance

B．welcome

C．unconcern

D．doubt

4.What’s the main idea of the passage?

A．Nissan will release drink-proof cars.

B．Traffic accidents will be decreased.

C．A project halving the number of accidents.

D．A new odor detection system.