Question

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 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.

According to the passage, the root 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

Only a small part of the Sun’s energy reaches the Earth’s surface because most of it _______________.

   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

We learn from the passage that _______________.

   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

【小題1】C

【小題2】C

【小題3】A

解析:

這篇屬于科普文，講述有關(guān)太陽能的問題。

【小題1】考點是：深層次理解能力。

細讀全文可知，地球上天氣變化的根源在于太陽能。

【小題2】考點是：細節(jié)理解能力。

從文章第二段首句可知，太陽能只有小部分才能到達地表，大多被表層大氣所反射或吸收。A、B兩項表述過于片面，且與文意不符，只有B項才概括全面。其中l(wèi)ose一詞用的恰到好處，可以涵蓋reflect和absorb之意。

【小題3】考點是：推理判斷能力

從文章第一段末句可知，地球上所有生物均要依靠太陽能來間接為他們提供食物。B 、C、 D 三項表述皆與文意相違。