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问题
单项选择题
将实验效应与公认的标准值或正常值作对照是
A．空白对照
B．实验对照
C．标准对照
D．自身对照
E．相互对照
答案
参考答案：
C
选择题
以下电路中，电路正确而且有电流通过的是（ ）
A．
B．
C．
D．
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填空题
选词填空。
go off, run off, by the time, on time
1. _____ I got back to school, the bell had already rung.
2. My alarm clock didn't _____ this morning.
3. I got up late and I had to _____ to the bus stop.
4. She couldn't get to school _____ because she missed the early bus.
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