The topic sentence in paragraph 2 is__________.(本题1.5分)
A、 At least 75 animal welfare organizations exist in America
B、 Vets can give animals an incredible level of medical care for an incredible price
C、 To pay for the high-tech health care, people can buy health insurance for their pets
D、 Beneath the furry luxuries, there lies a basic American belief: Pets have a right to be treated well

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