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The tiger may be more ancient and distinct than we thought. Tigers are less closely related
to lions, leopards and jaguars 36 these other big cats are to each other, according to a new
study. The genetic analysis also reveals that the tiger began evolving 3.2 million years ago, and
its closest living 37 is the equally endangered snow leopard. 38 the popularity and
endangered status of tigers, much remains to be discovered about them, including how they
evolved. It has long been known that the five species of big cat — the tiger, lion, leopard, jaguar
and snow leopard — and the two species of clouded leopard are more closely related to each
other than to other smaller cats. But it has been difficult to pin 39 the exact relationships
between them. So to find out more, scientists 40 an analysis of the DNA of all these
species.
【題組】39. (A) to (B) on (C) down (D) under