A. SINCE B. LATER C. AGAIN D. THENPART 3

10.

A. since

B. later

C. again

D. then

Part 3: Read the following passage and answer the following questions. (1 point)

Solar energy is a long lasting source of energy which can be used almost anywhere. To generate solar

energy, we only need solar cells and the sun! Solar cells can easily be installed on house roofs, so no

new space is needed and each user can quietly generate their own energy. Compared to other renewable

sources, they also possess many advantages. Wind and water power rely on turbines which are noisy,

expensive and easy to break down. Solar cells are totally silent and non-polluting. As they have no

moving parts, they require little maintenance and have a long lifetime.

However, solar energy also has some disadvantages. We can only generate solar energy during

daytime because the system depends on sunlight. Besides, solar cells require large area to work

effectively. The main disadvantage of solar energy is that it costs about twice as much as traditional

sources such as coal, oil, and gas. This is because solar cells are expensive. Scientists are hoping that the

costs of solar cells will reduce as more and more people see the advantages of this environmentally

friendly source of energy.