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1 Which two sentences from the article include CENTRAL ideas of the article?
1. Understanding how hair holds up under stress will help Yang design better materials.
2. They tested those hairs with increasing levels of tension, which is stretching or pulling, until
the fibers broke.
3. Proteins are long molecules that are an essential part of all living organisms.
4. The microscope images showed what happened to the cuticle and cortex when hair breaks.
(A) 1 and 2
(B) 2 and 3
(C) 1 and 4
(D) 3 and 4
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1 Which two sentences from the article include CENTRAL ideas of the article?
1. Understanding how h...
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