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问题 单项选择题 A3型题

男，营养状况良好，能独坐，见生人即哭，但还不会扶站，前囟1cm×1cm，下中切牙正在萌出。

该男孩最可能的月龄为（）

A.4个月

B.5个月

C.6～7个月

D.9个月

E.12个月

答案

参考答案：C

填空题

如图所示，a，b为两平行金属板，间距为10 cm，两板间充满磁感应强度为0.5 T的匀强磁场，磁场方向如图所示。开始时，开关S是断开的，等离子体从左向右射入两平行板之间，速度为v0=400 m/s，待稳定后两板之间的电压为___V，S闭合时，流过电阻R的电流方向是___（填“向上”或“向下”）。
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填空题
根据句意从方框内选择合适的词填空。
bright, achieve, certain, fairly, require
1. My old mobile phone is broken. It _____ mending.
2. For _____ reasons he was unable to attend the meeting.
3. She thinks she's _____ a lot this year. She's proud of what she's learnt.
4. English is _____ useful, but it's difficult to learn.
5. Simon is a _____ boy and he works hard. Everyone thinks that he will have a ________ future.
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