5. 為了幫助大家高效備考托福，小編為大家?guī)硗懈懽鞯膬?yōu)秀范文整理，希望對大家托福備考有所幫助。

New findings in scientific areas can examine and challenge previous assumptions. A recent finding concerning the meerkat, a burrow-dwelling animal in the African grasslands, has cast doubt upon the conventional ideas of altruism, the type of behavior in which an animal sacrifices its own interests for the benefit of another.

Meerkats were previously thought to be a typical altruistic animal. When the other meerkats feed, there is usually one meerkat watching out for predators. The sentinel meerkat gains nothing, it seems, for it can neither eat nor escape quickly and successfully after raising an alarm.

However, in the new findings, it's shown that the sentinel meerkat has already eaten food before standing guard, thus contradicting the thought that it has an empty belly while on the lookout. In addition to this, the sentinel is the first to see a predator, so it is the first to escape. It is also placed nearest a burrow, making it relatively easier to flee. Moreover, its alarm calls may cause the group either to gather or to spread rapidly, which may attract the predator's attention, providing the sentinel a better chance to escape.

The same is with supposed human altruistic behavior. Organ donation to strangers may be considered an unselfish act, which provides little reward to the donator. However, by donating his organ, the donator may most probably receive praise and appreciation from others. Isn't this non-material reward, which increases one's self worth, satisfactory to anyone?

托福寫作的誤區(qū)：語法并非可有可無

現(xiàn)在很多考友是生活在用英語的環(huán)境之中的，比如說在美國或者英國上高中的。當(dāng)然也有很多考友是在國內(nèi)純英語的國際學(xué)校求學(xué)，這些環(huán)境往往是全英文的環(huán)境。本來一個全英文的環(huán)境是十分有助于英語水平的提升的，但實際上，純英語的環(huán)境對于英語的語法要求并不嚴(yán)格。換句話說，有可能一句話雖然有語病，但是由于對方能聽懂，因此他也沒有糾正你，那么你也默認(rèn)這里是沒有問題的。因此我們會看到很多英語環(huán)境之內(nèi)的考生，往往在作文的部分折戟沉沙鐵未銷，就是因為這個關(guān)鍵性的語法的問題。因此，當(dāng)我們在準(zhǔn)備作文部分以及口語部分這些主觀題的時候，要注意在考試之前一定要好好打磨一下自己的語法，否則后患無窮!