[填空题]The(poison)（）gases from the cars have polluted the air.

[填空题]The (poison) （） gases from the cars have polluted the air.

[填空题]The(poison)（）gases from the cars have polluted the air.

[填空题]The (poison) ______ gases from the cars have polluted the air.

[填空题]The poisonous gases from that factory are very______(harm)to plants and animals around it．

[单项选择]Cars have traditionally been wasteful beasts. Every time a drop of gas explodes inside a cylinder(气缸), the energy gets passed along from the piston(活塞) to the crankshaft(曲轴), flywheel(飞轮), gearbox, drivetrain, and axles(轮轴). By the time the wheels actually turn, four fifths of the original energy has disappeared. The electric car goes a long way toward reducing wasted energy by replacing the internal-combustion engine with batteries. Even so, electric cars destroy about 60 percent of the energy because mechanical parts are still used to deliver energy from the bakeries to the wheels. Lately, though, engineers have come up with a far more efficient way to accomplish the same task: by using magnets in the wheels.
Why do electric cars still waste much of the energy
A. Because they have replaced the internal-combustion engine with bakeries.
B. Because they still use mechanical paas to transfer energy to the wheels.
C. Because they use magnets in the wheels which add weight to the car.
D. Because batteries are not powerful enough to drive the cars.

[填空题]Compared to luxury ears, economy cars have higher operation costs.

[单项选择]

Since the energy crisis, these big cars have become a real liability. They cost too much to run（）

A. lack of reliability
B. substitute
C. costly means of transport
D. disadvantage

[填空题]Pollutants from cars create a ______ which people in cars are most exposed to.

[填空题]Pollutants from cars cause ______ , which can damage buildings and pollute rivers.