内部过电压的数值一般可达相电压的（）倍。
A.1~2
B.2~3
C.0.2~0.5
D.10~20
参考答案：B
He worked late into the night yesterday. That’s ___ he couldn't get up on time this morning
A．how
B．why
C．what
D．when
翻译下面两个课内句子。
（1）君子博学而日参省乎己，则知明而行无过矣。
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（2）爱其子，择师而教之，于其身也，则耻师焉，惑矣！
