单词拼写。
1. I doubt whether the new policy will be in the _____ (国家的)interest.
2. Millions of wild flowers color the valleys, _____ (尤其)in April and May.
3. He _____ (承认)that he had been to the mountain village.
4. The fashion show last night was a great _____ (成功).
5. Too much homework brings great_____ (压力)on the students, which is bad for their health.
6. _____(公民)have the rights to vote.Nobody can take away the rights without good reasons.
7. His best friend was killed in a _____ accident.(交通)
8. The scientists have made a _____ (有价值的) discovery recently.
9. When coming a cross new words reading a newspaper, you needn't look up each word in a
d _____.(字典)
10. The bridge being built now will be forty meters in _____(长度).
1. national 2. especially 3.admitted 4. success 5. pressure
6. Citizens 7. traffic 8. valuable 9. dictionary 10. length
，已知断裂1 mol B—B键吸收167 kJ的热量，生成1 mol B≡B键放出942 kJ热量。写出B4转化为B2的热化学方程式： ；