Question

19．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 （蒸发） of water from the oceans and lakes．Sunlight also provides the energy used by green plants to ma ke 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．
24．According to the passage，the root cause for weather changes on the Earth isC．
A．the atmosphere surrounding the Earth         
B．water from oceans and lakes
C．energy from the Sun                          
D．greenhouse gases in the sky
25．Only a small part of the Sun's energy reaches the Earth's surface because most of it isC．
A．absorbed 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
26．We learn from the passage thatA．
A．all living things on the Earth depend on the Sun for their food
B．a 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．

Answer 1

分析 本文属于说明文阅读，作者通过这篇文章主要向我们描述了太阳对我们的重要作用，仔细讲述了太阳光对地球的影响等信息．

解答 24．C．细节理解题，根据第一段The Sun is the major source of energy for our planet可知，地球上天气变化的根源在于太阳能；故选C．
25．C．细节理解题，从文章第二段Much of the energy that comes from the Sun never reaches the Earth's surface可知，太阳能只有小部分才能到达地表，大多被表层大气所反射或吸收．只有B项才概括全面．其中lose一词用的恰到好处，可以涵盖reflect和absorb之意．故选C．
26．A．推理判断题，从文章第一段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可知，地球上所有生物均要依靠太阳能来间接为他们提供食物．故选A．

点评 本文是科教类阅读理解．做这类题材阅读理解时要求考生对文章通读一遍，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据