判断题

PN结空间电荷区由N型区到P型区电势能是逐渐上升的,能带逐渐向上弯曲,且成抛物线型。( )
A、正确
B、错误

答案：正确

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单项选择题

2.在我国，首次制定赎刑是在（）
A、夏朝
B、商朝
C、西周
D、秦朝

Directions: Choose the appropriate words from those listed below and fill them in the blanks.
dog lamb lion’s fish cat roses horse donkey swine
3. I won't waste good advice on John any more because he never listens to it. I won't cast pearls before ________.

答案： swine