英语专业4级

Year  2000 41.    Acute hearing helps most animals sense the approach of thunderstorm s long before people___.   A. do        B. hear            C. do them          D. hearing it  42.  This is an illness that can result in total blindness ___ left untreated.   A. after    B. if  C. since D. unless  43.    The central provinces have floods in some years, and ___.   A. drought in others       B. droughts are others    C. while other droughts   D. others in drought  44.   Do help yours