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问题 单项选择题

下列关于字符串的叙述错误的是（ ）。

A．创建了字符串对象后，字符串所代表的文本根据情况可改变

B．字符串由java.lang.String和java.lang.StringBuffer定义

C．字符串常用数组存储，处理字符串实际上就是对数组元素的分别处理，要注意数组下界不要越界

D．在Java语言中，字符串是作为对象来处理的

答案

参考答案：A

解析：一旦创建了―个字符串对象，该字符串所代表的文本就不能改变了。

单项选择题

由放射性同位素和放射性元素产生的射线探伤是指( )。

A．X射线
B．中子射线
C．γ射线
D．y射线
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填空题

When you stop and think about your high school or college alma mater, were your experiences more positive or negative Do your feelings of (1) in that school have anything to do with whether or not your school was single-sex or coed (2) to send their children to single-sex schools, because they feel both (3) when they study in the company of students of the same sex. They (4) .
For years, only parents who could afford to send their children to private schools, or who had (5) , chose single-sex education for their children. Single-sex schooling was (6) for most American families. Today, however, along with (7) , public schools are experimenting with the idea of (8) .
Girls may be the ones who benefit most from single-sex schooling. Studies have shown that (9) in coed classrooms because teachers sometimes pay more attention to boys. Girls’ (10) toward their studies tends to disappear as they begin to feel less successful. They start to (11) outperform them in math and science. As boys (12) , girls start to lose it. Moreover, adolescence is (13) for girls. As they experience adolescent changes, some girls become depressed, develop an addiction, or suffer from (14) .
In the early 1990s, some influential people said that being in single-sex classes could (15) . Schools across the country began creating single-sex classrooms and schools. But many critics claim that (16) may actually be detrimental to a girl’s education because they (17) of sex differences.
The renewed interest in single-sex schooling (18) among Americans. Those who give it full endorsement believe girls need an all-female environment to take risks and find their own voices. Those who (19) of single-sex schooling wonder whether students’ lack of achievement warrants returning to an educational system that divides the sexes. They believe there is no (20) .
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