不等式组$\left\{\begin{array}{c}x-2>0\\ \frac{x}{2}+1\ge x-3\end{array}\right.$的解集是

____

用所给单词完成填空。

    Last weekend , it ____ a sunny day . My mother and I ____ my grandparents . We went there  ____ bus . We ____ many things . My grandparents  ____ very happy when they____ us . Grandma ____ fish . After lunch , I played____ my cousin . He is one year____ than me . We ____a good time .

下列各组中的两种物质作用，反应条件(温度或者反应物用量)改变，不会引起产物种类改变的是 (　　)