If the sun has enough __26___ to warm and light the whole earth, it must have enough power to do other things, __27____. Can we use the sun’s __28____ energy to supply electricity or other types of power usually perform? The answer is __29_____.

For example, people have for many years been using the __30___ heat of the sun to cook by solar __31___ which have been built with several incurved __32___ reflecting the sun and focusing the heat on the cooking element. This __33____ can be used like a gas or electric stove; it is more expensive to make but it doesn’t need any __34__ and so costs __35___ to use. Another _36__ of using solar energy is in house heating.

The _37____ of energy we use most is electricity, and every day more is _38____. But electricity has to be made too, and to make it huge quantities of fuel is required---oil, coal, gas and nowadays even uranium.

The question which __39___ everyone today is; how long will these fuels _40__? Nobody knows it for sure, __41___ most experts think it will soon be difficult to obtain sufficient electricity from these sources. It is possible that the sun can make a(n) __42____ here, too.

Solar power has already been used to produce _43__ heat. In Southern France a solar furnace has been built, _44___ temperatures reach more than 3,000 centigrade. This furnace is not only used for experiment __45___, but could be used to produce steam for a power station.

26.A 27 B 28 B 29 D 30 D

31 B 32 A 33 D 34 B 35 D

36 A 37 D 38 C 39 B 40 D

41 C 42 A 43 C 44 B 45 D