C．cut back D．break down
解析：选B 根据下文“a physical calendar with a pen”可知，此处指需要用笔来“写下”这些事情。
17．A.understand C．display
B．damage D．protect
解析：选A 根据下文“it is this conscious connection that makes your note more effective”可知，这样做是为了让我们“明白”这个关联。
18．A.truth C．fact
B．benefit D．challenge
解析：选D 根据下文可知，这里是指真正的“挑战”。 19．A.replace C．consider
B．ignore D．improve
解析：选B 根据下文内容可知，此处是指清除掉或者“忽视”那些会影响我们的计划的无关紧要的事情。
20．A.powerfully C．bravely
B．immediately D．gradually
解析：选D 根据“This is not easy.”以及“with practice”可知，通过实践，我们“慢慢地”会做好这一点。
Ⅱ.短文改错
Many animals and plants had disappeared because of human activities. And many are at risk of disappearing. We need help. Luckily, many organizations are tried to prevent them from completely disappear. And we can help, too. Last week, when I was reading a newspaper, I read about conservation campaign led by Chester Zoo. It was raising money to help endangered animal around the world. After I read about it, I immediate decided to help. Though I just donated 50 dollars, I was happily that I did something to help. I think since we all do something to help for wild animals, many wild animals will be saved.
答案：第一句：had→have 第三句：We→They
第四句：tried→trying; disappear→disappearing 第六句：about后加a 第七句：animal→animals 第八句：immediate→immediately 第九句：happily→happy
5
第十句：since→if; 去掉for
6
