与下图人物无关的历史史实是
A.康乾盛世
B.两次雅克萨之战
C.大兴文字狱
D.设军机处
答案:D
If _________, the bird flu would produce a powerful poison that would kill the patients.
A. not treat B not treated C untreated D. Both B and C
杂技团中的演员在表演走钢丝时,神经系统中起着维持身体平衡作用的结构是( )
A.大脑
B.小脑
C.脑干
D.脊髓