Which is true about pessimistic people according to the lecture?
A. Pessimists have little control over their determination.
B. Pessimists have a welcome trait for entrepreneurs.
C. Pessimists are more likely to start smoking again sooner.
D. Pessimists like to take chances.
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What is advisable for viewing situations according to the speaker?
A. Having an optimistic outlook.
B. Having a pessimistic outlook.
C. Having a more optimistic view at the beginning.
D. Having a more pessimistic view at the beginning.
String对象的常用属性有几个
A. 1
B. 2
C. 3
D. 4
下面关于String对象描述正确的是
A. String对象需要先实例化才能使用
B. String对象的toLowerCase()方法获取大写方式
C. String对象有5个方法
D. String对象是自定义的对象
关于String对象说法，不正确的是
A. substr()方法需要传入开始位置
B. charAt方法返回的字符串长度可能大于1
C. toUpperCase方法获取字符的大写方式
D. splict()方法分割字符串
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