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【单选题】
Which one of the following statements is NOT meant by the writer?A.
Scientists have been trying to break the ice-rich layers of soil on Mars.
B.
Scientists have been surprised by how the soil on Mars behaves.
C.
Scientists have been trying to find out if there is life supporting material on Mars.
D.
Scientists have been trying to know if water ice will melt.
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【简答题】补充完整下面的类定义： class XCH{ char*a； public： XCH(char*a A) { //构造函数 a=new char[strlen(aA) +1]； strcpy(a，aA) ； } XCH&operator=(const XCH&x){//重载赋值函数 delete[ ]a； a=new char[strlen(x．A) +1]； strcpy(a，x．A) ； __...