摩托车加上消音器是在____处减弱噪声;“掩耳盗铃”是在____处减弱噪声.
有经验的果农在嫁接时必须保证接穗和砧木的____紧密结合,才能使接穗存活。
计算﹣(x4)3的结果等于____
—We all went to the park except you last weekend. Why didn't you come?
—Because I the park twice.