Lesson 5 Understanding Text A T or F -3Air traffic control units only specialize in providing air traffic control services.

When considering air: 1 - Air has mass 2 - Air is not compressible 3 - Air is able to flow or change its shape when subject to even small pressures 4 - The viscosity of air is very high 5 - Moving air has kinetic energy The correct combination of all true statements is: A: 1, 2, 3 and 5 B: 2, 3 and 4 C: 1 and 4 D: 1, 3, and 5

There’s a feeling of unrest nowadays. A: in the air B: on the air C: by air D: in air

4. From the control tower, air traffic controllers coordinate aircraft movement both ________ and on the ground. A: on the air B: in the air C: at the air D: of the air

For energy transport, the heat capacity of air is about 3 400 times greater than that of water.

智慧职教: Compressed air is supplied by air compressors to air receivers.

3 Tony kicked the ball high ______________ . A: at the back of B: on the beach C: in the sea D: in the air E: in the mountains

An air waybill is used for air transport. It is an evidence of a ( ).

The air leakage of tubular air preheater is larger than that of rotary air preheater (). A: Right B: Wrong

What is the talk mainly about A: The definition of air pollutant. B: The causes of air pollution. C: The dangers of air pollutants. D: Ways to fight air pollution.