______, oceans and seas are easy to be harmed by the development of human society.
A. Believe it or not
Believing it or not
C. Believe it not
D. Believe or not
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No longer__ to be monitor of the class.
A. is he fit
B. he is fit
C. he fit
D. fit he
利用while循环方式实现1-100的累加和,请给出相关程序代码。
设计一个简单的计算器,实现“加、减、乘、除”功能(四则运算:符号使用+、-、*、/)。计算器格式:请输入第一个数:请输入运算符:请输入第二个数: