--I hope he won't get ill during the examinations. --___________ . He has been very well recently. A. Certainly B. No C. Not D. Yes 答案:B否定回答用no,而不是not,此题回答是省略的,原为No,he won't.1995年美国教授Lagow报道,他制得了碳的第四种同素异形体——链式炔碳:…—C≡C—C≡C—C≡C—…。该物质的一个分子中含300—500个碳原子,性质很活泼。据此判断链式炔碳的熔点,估计比石墨( ) A.高 B.低 C.相等 D.无法判断