【題組】Reading 2       At one of the world’s highest lakes, the endangered Lake Titicaca frog survives hugevariations in temperature and intense UV rays by permanently living on the lake’s floor. Sincethe frog never comes to the surface, it breathes only through its skin. As a consequence, itevolved with many folds and flaps to increase its surface area. “Tragically, I’ve only seen thisfrog in a blender,” Cooke reports. “People have decided he’s a medicinal cure.” Cooke’s videosexpose frog juice bars, which have caused the ancient species to be on the brink of extinction. 20. The main idea of the above paragraph (Reading 2) is 
(A) Lake Titicaca frog is a strange animal.
(B) People only find this frog in a blender.
(C) Lake Titicaca frog is a rare amphibian species on the brink of extinction.
(D) Lake Titicaca frog never comes to the surface.
(E) The frog breathes only through its skin.