HOT Competition 3 Sep/8AM: Scientists have reproduced nanostructures f

1st and 2nd are contradictory bold statements with limitations but not entirely

(A) The first is a conclusion for which support is provided but is not the argument's main conclusion; the second is an unsupported premise supporting the argument’s main conclusion.
2nd is main conclusion not a premises- wrong

(B) The first is a conclusion for which support is provided; the second is another conclusion opposing the first conclusion.
2nd statement is not against completely first conclusion but a limitation

(C) The first is a conclusion for which support is provided; the second is another conclusion, limiting a possible interpretation of the first conclusion.
Yes first is a intermediate conclusion on which support is provided, 2nd matches our expectation that It is not completely against 1st conclusion but a limitation - correct

(D) The first is a premise supporting the only explicit conclusion; so is the second.
2nd is a conclusion ; not a complete premise- wrong

(E) The first is the argument‘s only explicit conclusion; the second is a premise supporting that conclusion.
Both bold statements against each other - wrong

In the argument given, the two portions in boldface play which of the following roles?


From the start we can prethink the roles of the boldfaces and then eliminate those choices that don’t support our prethinking:
We can see that the second boldface qualifies the first boldface and has some sort of relationship. The correct choice should also show this relationship.

(A) The first is a conclusion for which support is provided but is not the argument's main conclusion; the second is an unsupported premise supporting the argument’s main conclusion.

There is no main or secondary concsluion in the sentence. If there were two conclusion then usually one contradicts the other, but here no piece of info does so. The second is supported by the claim of scientists.

(B) The first is a conclusion for which support is provided; the second is another conclusion opposing the first conclusion.

The second conclusion doesn’t oppose the first conclusion. For this the second boldface should have said “it doesn’t absorb by up to 200%”. But this doesn’t happen.

(C) The first is a conclusion for which support is provided; the second is another conclusion, limiting a possible interpretation of the first conclusion.

Correct choice because because the second boldface indeed limits the interpretation of the first and says that a development doesn’t offer 200% efficiency. In other words, someone who reads the first may presuppose the that efficiency also must ncrease by 200%. But the second says that this is not the case.

(D) The first is a premise supporting the only explicit conclusion; so is the second.

The first and the second themselves are consluions made from a development. They are not premises.

(E) The first is the argument‘s only explicit conclusion; the second is a premise supporting that conclusion.

The second boldface doesn’t support the first, but instead limits the first. Hence this choice is incorrect.

Hence C

(A) The first is a conclusion for which support is provided but is not the argument's main conclusion; the second is an unsupported premise supporting the argument’s main conclusion.
Incorrect. Second sentence is in opposition to the first sentence.

(B) The first is a conclusion for which support is provided; the second is another conclusion opposing the first conclusion.
Incorrect. There is support provided - black wings absorbing more light. Second conclusion does not completely oppose the first.

(C) The first is a conclusion for which support is provided; the second is another conclusion, limiting a possible interpretation of the first conclusion.
Correct. There is support provided - black wings absorbing more light. Second conclusion cautions that one cannot assume the efficiency also improves by the same factor.

(D) The first is a premise supporting the only explicit conclusion; so is the second.
Incorrect.

(E) The first is the argument‘s only explicit conclusion; the second is a premise supporting that conclusion.
Incorrect.

Scientists have reproduced nanostructures found on butterfly wings in solar cells, a development that may enhance light absorption rate by up to 200%. The black wings of Pachliopta Aristolochiae have nanoholes that allow for the absorption of light over a wide spectrum better than smooth surfaces. However, the scientists maintain that this development doesn't imply that the efficiency of the whole system improved by the same factor.

In the argument given, the two portions in boldface play which of the following roles?


(A) The first is a conclusion for which support is provided but is not the argument's main conclusion; the second is an unsupported premise supporting the argument’s main conclusion. --> INCORRECT.

(B) The first is a conclusion for which support is provided; the second is another conclusion opposing the first conclusion. --> INCORRECT.

(C) The first is a conclusion for which support is provided; the second is another conclusion, limiting a possible interpretation of the first conclusion. --> CORRECT

(D) The first is a premise supporting the only explicit conclusion; so is the second. --> INCORRECT.

(E) The first is the argument‘s only explicit conclusion; the second is a premise supporting that conclusion. --> INCORRECT.

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