请观察下图,分析后回答下列问题:
图中A接受刺激后,最终引起细胞E收缩,这一生理活动被称之为(),完成这一生理活动的相关结构叫()。
参考答案:反射;反射弧
Chinese culture,has become ________ interest for people all over the world since the Shanghai Expo
and many foreigners are discovering ________ history of China. [ ]
A. the;/
B. an;the
C. an;/
D. the;the
哪三种元素的不协调会造成人体的疾病?()
A.硫
B.汞
C.钠
D.氢