【解答】
(A)
(6) a (California coasts)
(7) e (They live much longer than other generations.)
(8) b (Their ability to perceive magnetic fields.)
(9) a (That he would recognize some that came from his own yard.)
(10) c (Spring regrowth is visible.)
(B)
(11) d (It is not an easy life but it is rewarding.)
(12) c (The arrangement of tile-like pieces.)
(13) a (Color variation is strongly related to climate.)
(14) b (Butterflies have existed for at least 50 million years.)
(15) e (They have a covering to protect from ant bites.)
(C)
(16) d (Trees make the city look nicer.)
(17) a (Politicians have not felt that it is important to plant trees in cities.)
(18) b (It can take 30 years for a tree to have an overall positive effect.)
(19) d (Tree deaths in the countryside tend to be due to other trees, unlike in the city.)
(20) c (To improve the environment, it is important to keep trees from dying.)
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