二恶英的毒性是氰化钾的1000倍
参考答案:对
To be ______ changing times you cannot have your body in the 21st century and your head back in the past.
A.in step with
B.in front of
C.together with
D.apart from
病情可自行缓解的脑膜炎是
A.葡萄球菌脑膜炎
B.结核性脑膜炎
C.腮腺炎病毒脑膜炎
D.隐球脑膜炎
E.肺炎球菌脑膜炎