3. B.推理判断题.根据倒数第二段中 They had been doing an important job---eating insects. Now with so many frogs killed, the insects were increasing more rapidly. They were damaging the crops and spreading diseases.可以推断出庄稼收成不好, 孩子生病与青蛙减少, 害虫增多有关.

　　4. C.推理判断题.最后一句 These sounds of the night now have a much deeper meaning. 现 在夜晚的这些声音具有更深刻的意义. 该句是一个中介句, 说明人们过度捕杀造成生态失衡, 由此也影响了人类,因此,可以推断人与自然的和谐是重要.

　　【四川省资阳市模拟

　　阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。The extraordinary Eastgate Building in Harare, Zimbabwe’s capital city, is said to be the only one in the world to use the same cooling and heating principles as the termite mound (白蚁堆).

　　Architect Mick Pearce used precisely the same strategy when designing the Eastgate Building, which has no air-conditioning and almost no heating. The building — the country’s largest commercial and shopping complex — uses less than 10% of the energy of a conventional building of its size. The Eastgate’s owners saved $3.5 million on a $36 million building because an air-conditioning plant didn’t have to be imported.

　　The complex is actually two buildings linked by bridges across a shady, glass-roofed atrium (天井) open to the air. Fans suck fresh air in from the atrium, blow it upstairs through hollow spaces under the floors and from there into each office through baseboard vents (通风口). As it rises and warms, it is drawn out via ceiling vents and finally exists through forty-eight brick chimneys.

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