胶粘剂连接两种金属材料时，可以减少不同金属间连接的（）腐蚀。
A、介质
B、空气
C、电位
D、溶液
参考答案：C
She volleyball regularly for many years when she was young.
A．was playing
B．played
C．has played
D．had played
照样子，写句子。
例：棉鞋里有好多阳光呢！
1．公园里有好多______呢！
2．______有好多______呢！
