很多人都抱怨PTE考试有些难，其实主要原因还是没有好好进行PTE培训，经过系统的教导后，相信你的PTE写作、PTE阅读、PTE词汇、PTE口语、PTE听力能力都能提高一个档次。今天小编想给大家呈现这些内容。

　　RO：

　　A、Theyare caused by great temperature differences between adjacent air

masses. There are four major jet streams.

　　B、Sincethe progress of an airplane is aided or impeded depending on whether

tail windsorhead winds are encountered.

　　C、Insteadof moving along a straight line. the jet stream flows in a

wavelike fashion;the wavespropagate eastward (in the Northern Hemisphere) at

speeds considerably slower than the wind speed itself.

　　D、Jetstream. narrow. swift currents or tubes of air found at heights

ranging from 7to 8 mi(11.3–12.9 km) above the surface of the earth.

　　E、In the Northern Hemisphere the jet stream issought by eastbound aircraft.

in order to gain speed and savefuel. and avoided by westbound aircraft.

SWT：

　　Theco-evolutionary relationship between cows and grass is one of

nature'sunderappreciated wonders; it also happens to be the key to understanding

justabout everything about modern meat.

　　For the grasses.which have evolved to withstand the grazing of ruminants.

the cow maintains andexpands their habitat by preventing trees and shrubs from

gaining a foothold andhogging the sunlight; the animal also spreads grass seed.

plants it with hishooves. and then fertilizes it with his manure.

　　In exchange for these services the grasses offerruminants a plentiful and

exclusive supply of lunch. For cows (like sheep. bison.and other ruminants) have

evolved the special ability to convert grass— whichsingle-stomached creatures

like us can't digest—into high-quality protein. Theycan do this because they

possess what is surely the most highly evolveddigestive organ in nature: the

rumen. About the size of a medicine ball. theorgan is essentially a

forty-five-gallon fermentation tank in which a residentpopulation of bacteria

dines on grass.

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