(C2A) REVIEW: ENERGY SOURCES & OUR GREENER WORLD

Fossil fuels are nonrenewable  resources because they

• take millions of years to form
• are easily replaced
• are in high demand
• don't pollute the air

When steam (hơi nước) or water are used to turn a turbine, it can generate (tạo ra)

• electricity
• oil
• geothermal energy
• uranium

A problem with solar energy is that it is

• nonrenewable
• costly to build 
• too hot
• used too much

What is a disadvantage of nuclear power?

• The reactor (lò phản ứng) takes up too much space.

• It produces greenhouse gases.
• It produces radioactive (phóng xạ) waste.

One advantage to wind power is:

• Wind is free.
• Sometimes there is no wind.
• Birds can get hurt in the tower (tháp).

• Coasts (bờ biển) that have a lot of wind are expensive.

Hydropower is produced by what?

• water

• wind

• moving water

• the Sun

Wind, hydro and solar are __________ energy sources.

• modern

• renewable

• non-renewable

• new

'Abundant' trong câu sau đây có nghĩa là gì?

'Fish are abundant along the coral reefs.'

• thiếu hụt

• dồi dào, phong phú

• thuộc về nước

• thuộc về hạt nhân

'renewable' trong câu sau đây có nghĩa là gì?

'We are using renewable energy sources like wind and solar energy'

• thiếu hụt

• dồi dào, phong phú

• thuộc về nước

• có thể tái tạo được

'Unlimited' trong câu sau đây có nghĩa là gì?

'Renewable energy such as solar power is unlimited.'

• không giới hạn

• bị hạn chế

• thuộc về nước

• có thể tái tạo được