托福写作到底如何才能有成绩上的突破呢?主要还是要靠同学们平时的练习，同时可以找一些优秀的范文进行分析，吸取人家的高分经验。小编给大家整理了托福综合写作范文，供大家参考使用。一起来看看吧！
The lecturer points out several problems with the use of hydrogen-based fuel-cell engines in support of her claim that substituting them for internal-combustion engines is technologically unfeasible, environmentally unfriendly, and economically unviable.
First, the lecturer states that it is impractical to replace internal-combustion engines with fuel-cell engines because using the latter requires hydrogen in a pure liquid form, which is technologically challenging to both obtain and store. However, the reading argues that because hydrogen can be extracted from many resources including water, fuel cell engines powered by this infinite source of energy are an extremely attractive alternative.
Second, the lecturer refutes the claim in the reading that hydrogen cells are environmentally friendly. She argues that although engines that use hydrogen cells produce less pollution, the manufacturing of hydrogen cells generates large amounts of harmful by-products due to the burning of fossil fuels in the purification process.
Third, although the reading suggests that hydrogen-based engines are more fuel-efficient and thus economically competitive than internal-combustion engines, the professor argues that such an advantage is undermined by the fact that fuel-cell engines are extremely expensive to manufacture because they require the addition of platinum, a very rare and expensive material.
上面就是今天小编给大家整理的一篇托福综合写作范文，建议同学们进行自己的分析，将人家写得好的地方标注出来，然后整理一下，相信经过自己的加工以后可以用在自己的写作中。更多与托福写作相关的信息欢迎关注朗阁教育托福频道。
