有语句：string = "Python is good"，则string.lower()后str的值是:

If a country’s saving rate declined, then other things the<br/>same, in the long run it would have () A: lower<br/>productivity, but not lower real GDP per person. B: lower<br/>productivity and lower real GDP per person. C: lower<br/>real GDP per person, but not lower productivity D: neither<br/>lower productivity nor lower real GDP per person.

John Steinbeck mainly wrote about lower and lower middle class.

Small population may mean ______. A: higher productlvity, but a lower average income B: lower productivity, but a higher average income C: lower productivity and a lower average income D: higher productivity and a higher average income

Less-for-much-less positioning involves meeting consumers' lower performance or quality requirements at a much lower price.

下列语句均为类定义成员变量定义，其中合法的语句是（ ）。 A: string _string; B: string @string; C: string string; D: string _;

表示开头是小写的是 A: ^[a-z] B: [^[:lower:]] C: [^a-z] D: ^[[:lower:]]

Relative to the underlying stock, a call option always has A: a higher beta and a higher standard deviation of return. B: a lower beta and a higher standard deviation of return. C: a higher beta and a lower standard deviation of return. D: a lower beta and a lower standard deviation of return.

声明一个有3个元素的String类型的数组，不正确的是 A: String[] str = new String[3]; B: String str[] = new String[3]; C: String [] str = new String[3]; D: String[3] str = new String();

主方法的参数类型是 A: String[] B: String C: string[] D: string