原文：Between 1940 and 1959, overfishing led to crashes in salmon population so severe that in 1953 Alaska was declared a federal disaster area.
题干：Between 1940 and 1959, there was a sharp decrease in Alaska's salmon population. 原文中的crashes与题干中的sharp decrease属于近义词之间的替换。威海学为贵雅思托福培训
题干：The survey concluded that one-fifth or 20% of the household transport requirement as outside local area.
原文：Interest facts regarding transport were found: 95% was on foot; 80% was within the locality.
题干：Radar and sonar are based on similar ______
原文：But the underlying mathematical theories of radar and sonar are very similar.
题干：Radar is an inaccurate term when referring to bats because ____ are not used in their navigation system.
原文：It is technically incorrect to talk about bat 'radar', since they don't use radio waves.
题干：In the follow-up class, the teaching activities are similar to those used in conventional classes.
原文：Such methods are not unusual in language teaching.
题干：In the following-up class, the teaching activities _______ those used in conventional classes.
原文：Some hours after the two-part session, there is a follow-up class at which the students are simulated to recall the material presented. Once again the approach is indirect. The students do not focus their attention on trying to remember the vocabulary, but focus on using the language to communicate (e.g. through games or improvised dramatizations). Such methods are not unusual in language teaching.威海学为贵雅思托福培训
题干：Dr. Johnson believed that ____ is the major cause of this particular disease.
原文：Dr. Johnson is one of the leading scientists in this area. He believed that the disease could be cured. Certain experiments had been carried out through the last century however no evident result had been found. Still, he linked mainly food with this particular disease.