根据如图所示某牙膏商标上的部分文字,用化学用语填空:
(1)图中一种金属元素的符号 ____ ;
(2)n个硝酸根离子的符号____ ;
(3)碳酸钙高温分解反应的化学方程式 ____ .
某地理兴趣小组准备前往图示地区开展野外考察.读图分析,该区域的地势特点是( )
下列不属于近视眼的特点的是( )。
如图所示是近视眼和远视眼的成因示意图.下列说法正确的是( )
用所给词的适当形式填空
①I have two ____ (brother).
②There are two ____ (family) in the picture.
③ The old man has no ____ (son) or ____ (daughter).
④ My ____ (father) sister is my aunt.
⑤In the photo his mother's ____ (parent) are on the left.