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Difficulty: Very hardTransitions: Contrast and Concession

Biomimetic engineers studying the deep-sea glass sponge *Euplectella aspergillum* have long marvelled at its intricate skeletal lattice, which is composed entirely of brittle silica. The structure's unique hierarchical organization—spanning from nano-scale silica spheres to macro-scale cylindrical cages—distributes mechanical stress so effectively that it resists structural failure under immense benthic pressures. One might expect that replicating this precise architecture using synthetic polymers would yield materials of comparable resilience. ________, experimental models have shown that synthetic analogs fail to match the sponge’s fracture toughness due to the absence of the organic proteins that glue the natural silica layers together.

Which choice completes the text with the most logical transition?

  1. A
    Consequently
  2. StillAnswer
  3. C
    Furthermore
  4. D
    Specifically

Answer

Still
The correct option is the transition indicating contrast or concession. The text sets up an expectation in the sentence preceding the blank: that replicating the sponge's skeletal structure using synthetic polymers should yield highly resilient materials. The sentence with the blank, however, presents a contrasting outcome: synthetic models actually fail to match this resilience because they lack the organic proteins that bind the layers. The transition expressing that something is true despite the preceding statement is needed, which is the function of the transition indicating concession.

Step-by-Step Solution

1
Analyze the relationship between the ideas before and after the blank.
The sentence before the blank describes an expectation: that replicating the sponge's architecture would yield resilient materials. The sentence containing the blank describes a contrasting reality: experimental synthetic models fail to achieve this resilience.
Identifying the logical connection between these sentences is necessary to select the correct transition type.
2
Determine the required category of transition word.
A transition expressing contrast or concession (such as 'nevertheless', 'nonetheless', or 'still') is needed to connect the expectation of success with the reality of failure.
Only a contrast/concession transition can logically bridge these opposing ideas.
3
Evaluate the choices based on the identified relationship.
The transition meaning 'nevertheless' or 'even so' fits the context perfectly. The other choices represent cause-and-effect, addition, or elaboration, which do not fit the contrast between expectation and outcome.
This allows for the elimination of incorrect transition types and confirmation of the correct option.

Key Concept

Transitions: Contrast and Concession
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Topics

Transitions: Contrast and Concession

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