Question

【题目】The truth that trees are vital to our life is not a secret. They provide us with food, wood and most 【1】 (important), oxygen. Now there is one more thing we can add to this list—blocking out harmful bacteria from water.

The discovery 【2】 (make) by a team 【3】 (consist) of scientists from the Massachusetts Institute of Technology (MIT) and high school students who were seeking a natural water filter—one that would help communities in developing countries that do not have 【4】 (accessible) to modern water filter systems.

The 【5】 (research), led by Professor Rohit Karnik, decided to turn to trees for help because they could allow liquid to flow through, while blocking out air bubbles.

They began by cutting 1.5-inch-wide 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 containing red dye particles of different sizes through. To their amazement, they found that it was effective in trapping all the articles. 【6】 (encourage), the team conducted another experiment, this time with water that contained bacteria. Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through.

Answer 1

【答案】

【小题1】importantly

【小题2】was made

【小题3】consisting

【小题4】access

【小题5】researchers

【小题6】Encouraged

【解析】

试题分析：

【小题1】句意“最重要的是”，副词位于句首修饰整个句子，填importantly。

【小题2】发现和做出是被动关系，一般过去时，谓语动词填was made。

【小题3】这个小组由科学家和高中生组成，consist of “由……组成”没有被动，现在分词作定语consisting。

【小题4】固定短语“有权使用”have access to。

【小题5】研究人员们用复数形式researchers。

【小题6】小组和鼓励是被动关系，填过去分词作状语，位于句首首字母大写，Encouraged。