赋值表达式是由位于赋值运算符左边的变量和右边的【 】组成。
参考答案：表达式
解析：表达式的值的类型应与左边的变量类型一致或可以转换成左边的变量类型。
选择shadow或shade并用其适当的形式填空 .
①Sometimes people will get frightened by his own____________ especially at night.
②After a long walk, they needed to find some____________ and have a rest.
梯形螺纹的牙型角为（）
A、30
B、40
C、55
D、60
