食物中毒是由于进食了下述哪种食物而引起()。
A.有毒食物
B.腐败变质的食物
C.正常数量可食状态的有毒食物
D.动物性食物
E.植物性食物
参考答案:C
螺旋甾烷醇和异螺旋甾烷醇类皂苷元的结构特征有()
A.由27个碳原子组成
B.由30个碳原子组成
C.由A、B、C、D四个环组成
D.由A、B、C、D、E、F六个环组成
E.E和F环以螺缩酮形式连接
根据句意及首字母,写出正确的单词。
1. Most of my friends like loud music t_______ they can dance to.
2. Carmen likes m____ who play different kinds of music.
3. As the name s____ the band has lots of energy.
4. I like singers who write their own I ____ __.
5. I like music that I can d___ __ to.