《2025年优化探究同步导学案高中英语必修第二册人教版》

1. This is why... “这就是……的原因”
[教材原文] This is why we're here—to observe Tibetan antelopes. 这就是我们来这里的原因——观察藏羚羊。
[即学即练]——一句多译
我们应该读名著。这是因为阅读经典可以丰富我们的日常生活，减轻我们的压力。
① Reading classics can enrich our everyday life and relieve our pressure. This is why we should read classics.
② We should read classics. This is because reading classics can enrich our everyday life and relieve our pressure.
③ The reason why we should read classics is that reading classics can enrich our everyday life and relieve our pressure.
(1) This/That is why... 意为“这/那就是……的原因”，*why* 引导的从句表示结果；
(2) This/That is because... 意为“这/那是因为……”，*because* 引导的从句表示原因；
(3) The reason why... is that... 意为“……的原因是……”。

答案： 1.①This is why ②This is because ③The reason why is that

2. “only + 状语从句”置于句首
[教材原文] Only when we learn to exist in harmony with nature can we stop being a threat to wildlife and to our planet. 只有学会和大自然和谐共处，我们才不会成为野生生物和地球的威胁。
[即学即练]——完成句子/单句写作
(1) 只有每天花至少两个小时学习英语，你才能尽快取得进步。
Only by spending at least two hours learning English every day can you make progress as soon as possible.
(2) 直到那时，我才意识到，一个小小的善举可以对我们周围的人产生极大的影响。
Only then was I aware that a small act of kindness could make a great difference to those around us.
(3) 只有当你来到中国，你才能更好地体验中国的传统和文化。
Only when you come to China can you better experience Chinese traditions and cultures.
在英语句子中，为了表示强调，把“only + 状语(副词/介词短语/从句)”置于句首，主句要用部分倒装形式，即把主句中的助动词、情态动词或系动词 *be* 提到主语前面。

答案： 2.
(1)can you make progress
(2)was I aware
(3)Only when you come to China can you better experience Chinese traditions and cultures.

Ⅰ. 单句语法填空
1. This has led scientists to speculate on the existence (exist) of other galaxies.
2. The boy was enjoying the beauty (beautiful) of nature.
3. The boy was attacked (attack) by a dog when he was walking along the street.
4. I think we should also take effective (effect) measures to make our country more beautiful.
5. With the intention (intend) of becoming famous and rich, many ordinary people intend to take part in some TV shows.

答案： Ⅰ.单句语法填空
1.existence 2.beauty 3.was attacked 4.effective 5.intention

Ⅱ. 选词填空
adapt to, be aware of, make out, watch over, on average, be concerned about, make progress, remind sb. of
1. These photos remind me of the time when I used to live in Spain.
2. I could just make out a tall figure walking hurriedly through the bush.
3. Was it the language or something else that made it hard for you to adapt to the life there?
4. Her mother spent nearly two months watching over her children while she was on a business trip.
5. Now, do you know, on average how long someone spends surfing the net each day?
6. The medical community continues to make progress in the fight against cancer.
7. You should tell your parents that you're fine, otherwise they would be concerned about you.
8. We are/have been aware of the potential (潜在的) problems and have taken measures to stop them from coming out.

答案： Ⅱ.选词填空
1.remind me of 2.make out 3.adapt to 4.watching over 5.on average 6.make progress 7.be concerned about 8.are/have been aware of