一、回忆课文，写出下列短语
1．提出____________
2．得出结论____________
3．使显露；暴露____________
4．将……和……联系或连接起来____________
答案：1．put forw ard
2．draw/arrive at/come to/reach a conclusion
3．expose...to
4．link...to...
二、回忆课文，完成下列句子
1．约翰·斯诺是伦敦一位著名的医生——他的确医术精湛，因而成了照料维多利亚女王的私人医生。
John Snow was a famous doctor in London－________ expert，indeed，________ he attended Queen Victoria as her personal physician.
2．人们既不知道它的病源，也不了解对它的治疗。
________ its cause ________ its cure was understood.
3．每次爆发霍乱时就有成千上万惊恐的人病死。
So many thousands of terrified people died ________ there was an outbreak.
