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【单选题】
以下关于变量赋值的说法中,错误的是A.
变量只有在定义后才能使用
B.
boolean类型的变量值只能取true或false
C.
只有同类型同精度的值才能赋给同类型同精度的变量，不同类型不同精度需要转换后才能赋值
D.
不同类型和精度之间也能赋值，系统会自动转换
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Why did the author go to the mall?
A.
to buy a T-shirt .
B.
to enjoy herself.
C.
to buy a new dress.
D.
to buy a sweater.
【简答题】机械制图就是研究如何 机械图和 机械图的一门课程。
【单选题】Why did the author mention comments by the volunteer drivers in Paragraph 6-8?
A.
To prove that men in the 17-25 age bracket were the most dangerous and accident-prone group.
B.
To support the claim that music with a strong beat leads to aggressive driving.
C.
To indicate the pace of the driving is governed by the pace and beat of the music.
D.
To give an example that soothing music makes drivers relaxed and sleepy.
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