They began by cutting 1.5inchwide sections of tree bark from the branches of a white pine tree. The people related then tested the wood's filtering ability by pouring water __7__ (contain) red dye particles of different sizes through. __8__ their amazement, they found that it was effective in trapping all the particles. __9__ (encourage), the team conducted __10__ experiment, this time with water that contained bacteria. Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through.
语篇解读:树木对于我们的日常生活非常重要。它们不仅给我们提供食物、木材,最重要的是它们还给我们提供生存必需的氧气。除此之外,树木对于我们的生活还有一个非常重要的作用,即它们可以阻止有害细菌进入我们的水源。
1.that “__1__ trees are vital to our life”作The truth的同位语,所填词在同位语从句中不作句子成分,故用that。
2.importantly most importantly(最重要的是)置于句首,修饰后面的整个句子,相当于It is the most important that ...
3.was made 本句在讲述过去的事情,故用一般过去时;主语the discovery与make为被动关系,故用被动语态。
4.who/that 先行词为high school students,关系词在定语从句中作主语,故用who/that引导。
5.access have access to“接近,可以利用”。
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