问题
选择题
最近发生的双汇“瘦肉精”事件又引起了人们对食品安全的关注.下列有关瘦肉精(C12H18Cl2N2O)的说法中不正确的是( )
A.瘦肉精属于有机化合物
B.瘦肉精是由五种元素组成的
C.瘦肉精是由35个原子构成的
D.瘦肉精中碳元素和氮元素的质量比为36:7
答案
答案:C
最近发生的双汇“瘦肉精”事件又引起了人们对食品安全的关注.下列有关瘦肉精(C12H18Cl2N2O)的说法中不正确的是( )
A.瘦肉精属于有机化合物
B.瘦肉精是由五种元素组成的
C.瘦肉精是由35个原子构成的
D.瘦肉精中碳元素和氮元素的质量比为36:7
答案:C
从方框中选词用其适当形式填空。 | |
2. ______. What's the time, please? 3. It's seven o'clock. _______ go to school. 4. It's six o'clock. I must ______ now. 5. This is Jim's ruler. Please ______ it ______ him. 6. ______, Mike. Look at these flowers. 7. Where are the balls? They are ______, under the tree. 8. What's the time, please? ______. It''s four twenty. 9. Lucy and Lily ______ their mother. 10. ______ is your father? He''s about forty. |