Explanation: [改錯 1]
1. “Cram school teachers are a skillful lot.”
(X)2. “Elderly are occasionally healthier than people younger than themselves.”
No. 1 is correct, but no. 2 is wrong.
(在第1句中，”lot”是指一個人群。)
It must be “The elderly”, or “Elderly people”:
Answer 1: “The elderly are occasionally healthier than people younger than themselves.”
Answer 2: “Elderly people are occasionally healthier than people younger than themselves.”
“Elderly” is an (adj.), however, we can sometimes use adjectives as nouns by placing a "the" before them.
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