《2025年创新设计高中英语选择性必修第一册北师大版》

典型句式·默背
根据课文语境及汉语提示补全句子
1. [句型公式] “双重否定”表示肯定
[教材原句] Extinctions, where entire species are wiped out, are not unusual in our Earth's history.
物种灭绝，即某个物种的完全消失，在地球的历史上并不罕见。
2. [句型公式] 过去分词短语作定语
[教材原句] These include the third mass extinction, known as the“Great Dying”, which killed 90% to 96% of all species.
这其中包括被称为“大灭绝”的第三次大灭绝，在那期间 90%至 96%的物种灭亡了。
3. [句型公式] although 引导让步状语从句
[教材原句] Although it is not unusual for species to die out naturally, the rate at which this is now happening is cause for concern.
虽然物种的自然灭绝并不罕见，但现在灭绝的速度让人担忧。
4. [句型公式] 倍数表达法
[教材原句] They found that human activity is causing species to die out 1,000 times faster than normal.
他们发现人类活动导致物种灭亡的速度是正常情况的 1000 倍。
5. [句型公式] It is+形容词+that 从句
[教材原句] It is clear that human activity has negatively affected all other species on Earth, including animals and plants.
显然，人类活动对地球上所有其他物种产生了负面影响，包括动物和植物。
6. [句型公式] without 引导的含蓄虚拟条件句
[教材原句] Without forests, we would have no air to breathe, and without clean water we would be unable to survive.
没有森林，我们就没有可以呼吸的空气；没有干净的水，我们就无法生存。

答案： 1.are not unusual in our Earth's history 2.known as the“Great Dying” 3.Although it is not unusual for species to die out naturally 4.1,000 times faster than normal 5.It is clear that
6.Without forests;would have;without clean water we would be unable to survive

1 threat *n*. 威胁；（灾难等坏事）发生的可能
教材原文 After the lecture, I can see that the use of oil and coal is one of the biggest threats to our planet. 在讲座结束后，我了解到了石油和煤炭的使用是对我们星球最大的威胁之一。
感知 语言先输入
①Their existence poses a serious threat to the world peace.
②Some species will be under the threat of extinction if humans keep destroying their habitats.
记牢 知识再梳理
(1)pose a threat to... 对……构成威胁
under the threat of... 处于……的威胁之下
(2)threaten *vt*. 威胁，恐吓
threaten to do sth 威胁要做某事
threaten sb with sth 用某物/某事威胁某人
运用 单句语法填空/完成句子
① The bad men threatened to kill (kill) the professor if their demands were not met.
②The bear patted the fence fiercely, threatening us with its sharp teeth and strong paws.
熊猛烈地拍着栅栏，用它锋利的牙齿和强壮的爪子威胁我们。
③ As we all know, plastic bags floating in oceans pose a great threat to sea animals.
众所周知，漂浮在海洋中的塑料袋对海洋动物构成了巨大的威胁。

答案： 1.①to kill ②threatening us with its sharp teeth ③pose a great threat to sea animals