Unit 9 Human Biology Lesson 1 To Clone or Not to Clone 课后习题讲解 课件 2022-2023学年北师大版（2019）高中英语选择性必修第三册

UNIT 9 Human Biology Lesson 1 To Clone or Not to Clone 课后习题讲解 课本68页1 Li Zhen and her friends are designing a poster for their school's monthly activity "Human and Us". Complete her report about the development of cloning using the correct form of the words and phrases below. forever barrier in comparison clue crucial accurate identical twins ethical abuse blessing Cloning occurs when an egg splits and creates 1___________________________ The first animal to be successfully cloned by scientists was a sheep called Dolly. Despite the initial success, she suffered from an illness and died at the age of six. identical twins Since then, other animals such as goats and camels have been cloned but have also experienced similar health problems. Scientists are not sure if this problem will continue to happen 2______________. forever 3___________________with other species, attempts to clone monkeys have been far more complicated a