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.
- TOEFL TPO topics - Integrated Writing TasksTPO - 06 73
- TPO-08 - Integrated Writing Task Toward the end of his life, the Chevalier de Seingalt (1725-1798) wrote a long memoir recounting his life and adventures. The Chevalier was a somewhat controversial figure, but since he met many famous people, including ki 86
- TPO-11 - Integrated Writing Task A recent study reveals that people especially young people are reading far less literature,novels, plays, and poems,than they used to. This is troubling because the trend has unfortunate effects for the reading public, for 40
- TPO-19 - Integrated Writing Task Many consumers ignore commercial advertisements. In response, advertising companies have started using a new tactic, called “buzzing." The advertisers hire people,buzzers,who personally promote (buzz) products to people 40
- TPO-06 - Integrated Writing Task Communal online encyclopedias represent one of the latest resources to be found on the Internet. They are in many respects like traditional printed encyclopedias collections of articles on various subjects. What is specifi 60
Grammar and spelling errors:
Line 1, column 199, Rule ID: COMMA_PARENTHESIS_WHITESPACE
Message: Put a space after the comma
Suggestion: , environmentally
...on engines is technologically unfeasible,environmentally unfriendly, and economically unviable. ...
^^^^^^^^^^^^^^^^
Discourse Markers used:
['first', 'however', 'if', 'second', 'so', 'third', 'thus']
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance in Part of Speech:
Nouns: 0.261682242991 0.261695866417 100% => OK
Verbs: 0.144859813084 0.158904122519 91% => OK
Adjectives: 0.135514018692 0.0723426182421 187% => Less adjectives wanted.
Adverbs: 0.0514018691589 0.0435111971325 118% => OK
Pronouns: 0.0233644859813 0.0277247811725 84% => OK
Prepositions: 0.144859813084 0.128828473217 112% => OK
Participles: 0.0327102803738 0.0370669169778 88% => OK
Conjunctions: 3.82311412106 2.5805825403 148% => OK
Infinitives: 0.018691588785 0.0208969081088 89% => OK
Particles: 0.00467289719626 0.00154638098197 302% => OK
Determiners: 0.0981308411215 0.128158765124 77% => OK
Modal_auxiliary: 0.00467289719626 0.0158828679856 29% => OK
WH_determiners: 0.00934579439252 0.0114777025283 81% => OK
Vocabulary words and sentences:
No of characters: 1408.0 1645.83664459 86% => OK
No of words: 196.0 271.125827815 72% => More content wanted.
Chars per words: 7.18367346939 6.08160592843 118% => OK
Fourth root words length: 3.74165738677 4.04852973271 92% => OK
words length more than 5 chars: 0.510204081633 0.374372842146 136% => OK
words length more than 6 chars: 0.433673469388 0.287516216867 151% => OK
words length more than 7 chars: 0.30612244898 0.187439937562 163% => OK
words length more than 8 chars: 0.214285714286 0.113142543107 189% => Too many words length more than 8 chars.
Word Length SD: 3.82311412106 2.5805825403 148% => OK
Unique words: 116.0 145.348785872 80% => More unique words wanted.
Unique words percentage: 0.591836734694 0.539623497131 110% => OK
Word variations: 55.7092973537 53.8517498576 103% => OK
How many sentences: 6.0 13.0529801325 46% => More sentences wanted.
Sentence length: 32.6666666667 21.7502111507 150% => OK
Sentence length SD: 79.399132377 49.3711431718 161% => OK
Chars per sentence: 234.666666667 132.220823453 177% => OK
Words per sentence: 32.6666666667 21.7502111507 150% => OK
Discourse Markers: 1.16666666667 0.878197800319 133% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 1.0 3.39072847682 29% => OK
Readability: 76.0340136054 50.5018328374 151% => OK
Elegance: 2.0 1.90840788429 105% => OK
Coherence and Cohesion:
Essay topic to essay body coherence: 0.651015935028 0.549887131256 118% => OK
Sentence sentence coherence: 0.205331352012 0.142949733639 144% => OK
Sentence sentence coherence SD: 0.0734877163448 0.0787303798458 93% => OK
Sentence paragraph coherence: 0.828525192678 0.631733273073 131% => OK
Sentence paragraph coherence SD: 0.142480966739 0.139662658121 102% => OK
Sentence topic coherence: 0.398449608869 0.266732575781 149% => OK
Sentence topic coherence SD: 0.0775040718902 0.103435571967 75% => OK
Paragraph paragraph coherence: 0.34500717883 0.414875509568 83% => OK
Paragraph paragraph coherence SD: 0.020289749049 0.0530846634433 38% => OK
Paragraph topic coherence: 0.47348012329 0.40443939384 117% => OK
Paragraph topic coherence SD: 0.0678702352118 0.0528353158467 128% => OK
Task Achievement:
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 3.0 4.45695364238 67% => OK
Sentences with neutral sentiment: 0.0 4.26048565121 0% => More neutral sentences wanted.
Positive topic words: 3.0 3.49668874172 86% => OK
Negative topic words: 3.0 3.62251655629 83% => OK
Neutral topic words: 0.0 3.1766004415 0% => More neutral topic words wanted.
Total topic words: 6.0 10.2958057395 58% => OK
What are sentences with positive/Negative/neutral sentiment?
---------------------
Minimum 200 words wanted.
Rates: 60.0 out of 100
Scores by essay e-grader: 18.0 Out of 30
---------------------
Note: This is not the final score. The e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.