阅读理解
(2013温州)
It is widely agreed that the overuse of fossil fuels，such as coal and oil has caused serious environmental problems．Scientists are trying to find new clean energies that do not pollute the air，the water or the ground．Solar power is one of them．

Solar power is a kind of electricity which is produced by taking energy from the sun，using solar panels．The solar panels are usually fixed on the roofs of houses and buildings．It is the family solar power system．Some countries are even beginning to build solar power plants by setting thousands of solar panels in the places where there is enough sunshine．Solar power has many advantages．The power is easy to get and will never be used up．Whenever it is sunny，there is the power．The power is clean and renewable．It helps to reduce waste and pollution，which is great for the environment．In the areas that are too far away to send electricity to or not easy to build electric power plants，solar power is especially necessary．It enables the people there to use lights，TVs，computers，washing machines，fridges and many other things．
Therefore，more and more countries，such as China，the USA，Japan and India，encourage scientists to develop practical technology to put solar power to use．However，the power is not as widely used as expected．
One of the challenges is that a solar power system needs sunshine．Countries or areas with a lot of rain，like the UK，are not suitable to develop such power systems．Secondly，a solar power plant requires a very large site to fix enough solar panels to collect sunlight and change it into electricity．Maybe an area in the desert would be one of the perfect places for such a plant to build．What’s more，solar panels are expensive at present though the energy itself doesn’t cost anything．
Today scientists are working hard to develop more practical and cheaper solar power systems．Maybe one day solar power will be one of the most important clean energies in our life．
Solar power is a kind of energy taken from________．

A．the air

B．the sun

C．the water

D．the ground

The underlined word“reduce”probably means________．

A．to make something less

B．to make something better

C．to make something more

D．to make something cleaner

What is the fourth paragraph of the passage mainly about？

A．The ways to use solar power．

B．The advantages of solar power．

C．The places to build the solar power plants．

D．The difficulties of putting solar power to use widely．

What can we learn from the passage？

A．Solar energy itself is expensive．

B．Solar power will be used up very soon．

C．Solar power is a kind of clean and useful energy．

D．Solar power is much better than the other energies．