2．challenge n．& vt.挑战→challenging adj.困难的；挑战性的

　　3．construct vt.建设；修建→construction n．建设

　　4．enthusiastic adj.热情的→enthusiasm n．热情

　　5．cautious adj.谨慎的→caution n．谨慎

　　6．universe n．宇宙→universal adj.普遍的；宇宙的

　　Ⅲ.语境填词(根据提示用适当的单词或短语填空)

　　1．At the meeting, he put_forward(提出) a proposal that children be exposed_to(暴露) challenges(挑战) but his proposal was rejected(反对) by the family.

　　2．The outbreak(爆发) of the deadly(致命的) disease urged a cure(疗法) be found，which was a challenge(挑战) but the experts(专家) and physicians(医生) were determined to defeat(打败) it.

　　3．After some research, the police drew_a_conclusion(得出结论) that the factory was to_blame(应负责) for the pollution(污染)．

　　4．It makes_good_sense(合情合理的) for parents to be strict_with(对……严格要求) their kids but severe(严重的) punishment is not suggested.

　　5．It has been announced(宣布) that apart_from(除……之外) Tom, two others are also suspected(怀疑) of the theft.

　　Ⅳ.语境记忆(背诵语段，记忆单元词汇)

　　From the scientific analysis，the experts who attend the meeting conclude that it is really a challenge to cure these infected patients.They announce they will be positive and enthusiastic about making contributions to it.

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