【正文】
consequently, tunas do not need to suck in water。look at the four squares [■] that indicate where the following sentence can be added to the passage。where would the sentence best fit?(選自official guide p64)paragraph 3: ■exhibitors, however, wanted to maximize their profits, which they could do more readily by projecting a handful of films to hundreds of customers at a time (rather than one at a time) and by charging 25 to 50 cents admission. ■about a year after the opening of the first kinetoscope parlor in 1894, showmen such as louis and auguste lumiere, thomas armat and charles francis jenkins, and orville and woodville latham (with the assistance of edison39。extinct but already fully marine cetaceans are known from the fossil record. ▇how was the gap between a walking mammal and a swimming whale bridged? ▇missing until recently were fossils clearly intermediate, or transitional, between land mammals and cetaceans。于是,搜索段落,答案鎖定在第二個方框前的那一句the raising of livestock is a major economic activity in semiarid lands, where grasses are general the dominant type of natural vegetation。有了上面的理論鋪墊,我們再來看小插題就容易得多了!例如,前面給出的那道例題,▇the raising of livestock is a major economic activity in semiarid lands, where grasses are general the dominant type of natural vegetation. ▇the consequences of an excessive number of livestock grazing in an area are the reduction of the vegetation cover and the trampling and pulverizat