2019学年度人教版选修八Unit 5 Meeting your ancestors Peeriod2Language points学案设计

核心单词

1. alternative

n.可供选择的事物；（两者或以上）可能的选择

adj. 供选择的, 二选一的

常用结构：

have no alternative but to do sth.

只能做某事；除¡­¡­外别无选择

We have no alternative but to go on.

除了继续下去,我们别无选择。

There was no other alternative but to fight till the victory.

除了战斗到胜利,别无选择。

联想拓展：

alternatively adv. 或者，二者择一地

alternate vt. 使交替；vi.交替；adj. 交替的；轮流的

高手过招：

(1)单项填空

In this school, the students have three courses, and seven courses.

A. required; alternative B. requiring; alternative

C. required; alternate D. requiring; alternate

解析：选A。require(尤指根据法规) 规定、需要，此处用过去分词required修饰courses，因为两者之间为被动关系。后空意思为¡°选择，选其一¡±，alternative符合句意。

(2)单句改错

①I had no alternative but report him to the police.

②You have the alternative to speaking or keeping quiet.

③Tom and Harry do the work on alternative days.

答案：①report前加to ②to→of

③alternative→ alternate

2. arrest

vt. 逮捕，拘留，吸引(注意)

n.[C]逮捕

常用结构：

be arrested for sth. 因某事而被捕

arrest one s attention吸引某人的注意

under arrest被捕；被拘留

The criminal was arrested yesterday.那名罪犯昨天被捕了。

What she did arrested my attention. 她所做的吸引了我的注意力。

高手过招

用适当的介词或arrest 的适当形式填空