We experience different forms of the Sun’s energy every day. We can see its light and feel its warmth. The Sun is the major source of energy for our planet. It causes the evaporation (蒸發(fā)) of water from the oceans and lakes. Sunlight also provides the energy used by green plants to make their own food. These green plants then provide food for all organisms(生物) on the Earth.
Much of the energy that comes from the Sun never reaches the Earth’s surface. It is either reflected or absorbed by the gases in the upper atmosphere. Of the energy that reaches the lower atmosphere,30% is reflected by clouds or the Earth’s surface. The remaining 70% warms the surface of the planet, causes water to evaporate, and provides energy for the water cycle and weather. Only a tiny part, approximately 0.023%, is actually used by green plants to produce food.
Many gases found in the atmosphere actually reflect heat energy escaping from the Earth’s surface back to the Earth. These gases act like the glass of a greenhouse in that they allow energy from the Sun to enter but prevent energy from leaving. They are therefore called greenhouse gases.
When sunlight strikes an object, some of the energy is absorbed and some is reflected. The amount reflected depends on the surface. For example, you’ve probably noticed how bright snow is when sunlight falls on it. Snow reflects most of the energy from the Sun, so it contributes to the low temperatures of winter. Dark-coloured surfaces, such as dark soil or forest, absorb more energy and help warm the surrounding air.
小題1:According to the passage, the root( 根本的) cause for weather changes on the Earth is         .
A．the atmosphere surrounding the Earth
B．water from oceans and lakes
C．energy from the Sun
D．greenhouse gases in the sky
小題2:Only a small part of the Sun’s energy reaches the Earth’s surface because most of it is         .
A．a(chǎn)bsorbed by the clouds in the lower atmosphere
B．reflected by the gases in the upper atmosphere
C．lost in the upper and lower atmosphere
D．used to evaporate water from the oceans and lakes
小題3:We learn from the passage that         .
A．a(chǎn)ll living things on the Earth depend on the Sun for their food
B．a(chǎn) forest looks dark in winter because it absorbs solar energy
C．only 0.023% of the energy from the Sun is made use of on the Earth
D．greenhouse gases allow heat energy to escape from the Earth’s surface

小題1:C
小題2:C
小題3:A

試題分析：本文介紹了太陽對我們的重要作用，仔細(xì)講述了太陽光對地球的影響等信息。
小題1:C 細(xì)節(jié)題。根據(jù)第一段The Sun is the major source of energy for our planet. It causes the evaporation (蒸發(fā)) of water from the oceans and lakes. Sunlight also provides the energy used by green plants to make their own food. These green plants then provide food for all organisms(生物) on the Earth說明太陽的能量是最重要的原因，故C正確。
小題2:C 細(xì)節(jié)題。根據(jù)第二段1,2行uch of the energy that comes from the Sun never reaches the Earth’s surface. It is either reflected or absorbed by the gases in the upper atmosphere.說明C正確。
小題3:A 細(xì)節(jié)題。根據(jù)第一段最后3行Sunlight also provides the energy used by green plants to make their own food. These green plants then provide food for all organisms(生物) on the Earth.說明太陽才是人們的衣食父母，故A正確。
點(diǎn)評：本文細(xì)節(jié)題居多，答題時在文章找到對應(yīng)的地方，用筆進(jìn)行標(biāo)記，這有利于后期有時間檢查時可以立刻找到答案的位置。仔細(xì)理解作者所講的意思，再結(jié)合選項，通過排除法和自己對全文的把握，選出正確答案。
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