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答案解析:
1.答案:the average income of the staff decreased by 40 percent
详解:
考查数字增减表达法:“减少了40%”译作decrease/drop/reduce by 40%。
2.答案:how can/could he be late for the opening ceremony
详解:
考查情态动词:can/could用于疑问句，后面跟动词原形表示对现在或一般情况的推测。
考查短语:“开幕式”译作opening ceremony。
