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课程

• Cost an arm and a leg: meaning and use Describe a high price in conversation. Practice cost and paid, past and present forms, and more neutral ways to discuss money. B1
• Killer asteroids No known significant threat is a qualified claim: it refers to what is known and what counts as significant in that report. It does not… B1 4秒
• Short answers in English: Choose the right helper A short answer provides a complete, polite response without unnecessary repetition. English relies on auxiliary verbs such as do, be, have… B1 5秒