1. c
(a) x, ACE2在宿主身上
(b) x, 必須要有S1的RBD才能與宿主的ACE2結合
(c) O, S1上的RBD與ACE2結合
(d) 由文章僅能得知 SARS-CoV-2 > SARS-CoV
(e) x,這樣講有點怪，應該是病毒會被細胞吃進來 形成endosome，我隨便找的圖
2. a
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