D
39 | Whereas a ramjet generally cannot achieve high speeds without the initial assistance of a rocket, a scramjet, or supersonic combustion ramjet, can attain high speeds by reducing airflow compression at the entrance of the engine and letting air pass through at supersonic speeds.
Unlike the ramjets, generally unable to achieve high speeds without the initial assistance of | 做对了，但排除OE的方法不正确
我的方法：unlike 比较两个object而这里比较的是两个object的具体动作
正确排除OE的方法
1. *"Unlike" is a problem because it makes us compare ramjets to ramjets! Notice that a scramjet is a kind of ramjet. It would be like saying "Unlike dogs, chihuahuas, which are small dogs, do not need much food." Chihuahuas may be unlike *most* dogs, but we can't say they are unlike dogs in general!
Ninja：There's nothing inherently wrong with comparing a plural noun to a singular one. But, as Dmitry Faber noted in an earlier post, (D)'s comparison is illogical because a scramjet seems to be a kind of ramjet. To see why this is problematic, consider the following examples:
1) Although dogs are generally excellent companions, Tim's golden retriever smells like patchouli and is often sulky and lethargic.
2) Unlike dogs, which are excellent companions, Tim's golden retriever smells like patchouli and is often sulky and lethargic.
Notice that the first sentence makes sense. Dogs generally behave one way, but Tim's dog is an exception to this general canine rule. However, the second sentence doesn't work -- Tim's golden retriever isn't unlike dogs. It is a dog!
OE's logic is like the second sentence above. A scramjet can't be unlike ramjets, because it's a type of ramjet! Rather, it makes more sense to write that ramjets usually behave one way, but this particular ramjet behaves a different way. This is the meaning conveyed by (B).
2. *"The ramjets" is wrong. We aren't talking about a certain group of ramjets, so "the" is inappropriate. It's like saying "I like the apples." If you aren't talking about a specific group of apples, it makes no sense.
3. *The modifier starting with "generally unable" is wrong. It is taking the form of an adverbial modifier, so we'd actually expect it to modify the following clause: "a scramjet . . . can attain high speeds." So we're saying "Unable to achieve high speeds, a scramjet can attain high speeds." Of course this is impossible. Now if what I'm saying doesn't seem accurate to you, it's perhaps because we have *two* initial modifiers in a row in this choice, making it hard to tell what the sentence is really trying to say. |
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发表于 2022-11-6 18:46:08
