① —Who is she?
—She's my teacher，Miss Fang.
②—Who is she?
—She's my teacher，Mrs Wang.
③—Who is he?
—He's my teacher，Mr Zhang.
④—Who is he?
—He's my teacher，Mr Liu.
____
Kate is very ________. She likes to stay at home and reads books.
以下那一项不是威胁生物多样性的原因？（）
