单项选择题

智障学生执笔握笔困难的原因往往是由于（）发展较慢。
A、肌肉发育
B、控制能力
C、精细动作
D、肢体动作

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单项选择题

无痛性肉眼血尿一般为泌尿系结石特点

A．对
B．错

单项选择题

David is of the opinion that people who drive SUVs are dangerous drivers. He often thinks that people driving SUVs are driving rashly, even when other observers can see nothing wrong with the behavior of the SUV drivers. What factor is affecting his perception in this case?
A、his interests
B、his expectaions
C、his personality
D、his attitude