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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. (2010¡¤01¡¤陕西师大附中月考)
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 (原创)
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....
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