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解析：选B.句意：我们极力劝说他待在家里,但大都是徒劳的,尽管他生着重病,最后还是去了工地.in vain(＝vainly)徒劳地,白费力气地. 3．At last she wiped________the jar and filled it with clean water. A．off B．up C．out D．away 解析：选C.考查wipe短语.wipe out“擦净……的内部”;wipe...off“擦掉”; wipe...up“擦净(液体等)”;wipe...away“擦去(眼泪)等”. 4．It is not a good habit to state your opinion________ and you’d better think it over before you act. A．at all B．full of faith C．at once D．at random 解析：选D.从“you’d better think it over before you act”看出要“三思而后 行”.空白处应该填入at random,前半句“随便发表你的观点不是一种好习惯”,与后半句相吻合. 句型巧析 1(教材P39)Meanwhile,governments worldwide have also underlined the_fact_that thorough and systematic medical research on Bird Flu... 同时,全球各国政府也重视这个现实,那就是,对禽流感进行全面有序的医疗研究…… 【句法分析】 the fact that...,that引导的为同位语从句，用来解释说明某一名词的内容和实质；同位语从句一般用that而不用which引导，但也可以用连接代词(what，which，who)、连接副词(when，where，why，how)或whether引导。 ①The young man made a promise to his parents that he would try to earn his own living after graduation. 这位年轻人向他的父母许诺说毕业之后他将努力自食其力. ②I have no idea how he did it. 我不知道他是如何做的. | 
