What is the main idea of the passage?

A．Exercise strengthens people' s body.

B．Exercise helps babies to grow.

C．Exercise improves people' s life.

D．Exercise benefits the brain.

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答案解析

主旨大意题。
通读全文可知，文章主要讲的是运动与大脑在生命各个阶段的变化有关，运动有助于大脑发育并保持身体健康。故选D。

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1 根据下面资料，回答题
In 1542, Francisco de Orellana led the first European voyage down the Amazon River. During this voyage the explorers met a lot of resistance (抵抗) from the local Indians. In one particular tribe the women fighters were so fierce that they drove their male fighters in front of them with spears. Thus the river was named after the famous women fighters of the ancient Greek stories, the Amazons
This voyage also started our wonder of the greatest river and the largest area of rainforest in the world. About 20% of all fresh water carried to the oceans is from the
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After whom was the Amazon River named?

A．The Indian women fighters.

B．The head of an Indian tribe.

C．The first explorer of the river.

D．The women fighters in ancient Greek stories.

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2 Which of the following statements is true?

A．The Amazon basin is the largest in the world.

B．The Amazon River causes huge rains every summer.

C．The Amazon rainforest supports about 20% of the world' s plants.

D．The Amazon River carries 75% of the world' s water to the oceans

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3 Why is CO2 compared to a fertilizer in Para. 3 ?

A．They both absorb light.

B．They both store heat.

C．They both help plants grow.

D．They both cause global warming.

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