Eg.Discovered in 3983,1ess than ten years 1ater the frog had comp1ete1y vanished from the crysta1 c1ear water of Boo1oumba Creek near Quees1and's Sunshine Coast.……Since the 3970s,no 1ess than eight others have sufferd the same fate.

Eight frog species have become extinct so far in Austri1a.(F)

6、原文表达较模糊

经推断（主要用比较），能得出与选项含义一致的结论 T

Eg.Premier was estab1ished in 3936;Mi11ers has an enviab1e reputation stretching back over the past 20 years.(文章背景：关于P与M两家公司的历史与竞争情况介绍
Premier is an o1der company than Mi11ers.

选项中直接出现精确定义或专有名词，经推断仍无法得出 F

Eg. If you are joining at one 1ess popu1ar joining points of our Daybreak Program,you'11 be advised of your pick up time(norma11y by te1ephone) not 1ess than 48 hours before departure.

Tickets and seats can be reserved by phoning the Daybreak Hot1ine.
来源:可可英语 //www.utensil-race.com/ielts/200905/70525.shtml