如图所示，、、是三个完全相同的小灯泡，串联后接在电压为6V的电路中，原来三个小灯泡都正常发光，现在三个小灯泡都不亮了．用电压表接在a、c两端时，示数是6V；接在a、b两端时，示数是0．接在b、d两端时

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如图所示，

、

是三个完全相同的小灯泡，串联后接在电压为6V的电路中，原来三个小灯泡都正常发光，现在三个小灯泡都不亮了．用电压表接在a、c两端时，示数是6V；接在a、b两端时，示数是0．接在b、d两端时，示数也是0，那么灯丝断了的小灯泡是（）

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C

Manners in a dinner party
What to take	You can bring some drinks like ____ juice, beer or something like these.
When to arrive	You should arrive on time or no more than ____minutes late. If you'll be fifteen late, you should give the host a ____.
What to do at the table	Try to be relaxed and ____ at the table. If you can't use the knife and ____ , you can watch others.