题干
The rapidly growing birth rate brings about a lot of environment problems, which the government is supposed to take _____.
A：significantly
B：severely
C：earnestly
D：seriously
答案(点此获取答案解析）
D
在强热时分解的产物是
．
．
和
，则该反应中化合价发生变化和未发生变化的N原子数之比为