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<閱讀測驗>[題組:第40題到第43題]42. According to the passage, which of the following statements is true regarding big cats?
(A) Some big cats evolved into jaguars 16 million years ago.
(B) The oldest fossil of big cats ever discovered is 3.8 million years old.
(C) Big cats are descendants of snow leopards living in high mountains.
(D) Tibetan blue sheep was a main food source for big cats in the Himalayas.