如图所示，两个灯泡组成串联电路，电源电压为6V，闭合开关S后，

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如图所示，两个灯泡组成串联电路，电源电压为6V，闭合开关S后，两灯均不发光，用一只理想电压表测量电路中a、b 间电压为0，b、c间电压为6V，则电路中的故障不可能为

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A． L₁短路且L₂开路

B．L₁和L₂均开路

C．L₁开路且L₂短路

D．只有L₂开路

答案

阅读理解

阅读理解。

There are seven days in a week. Most children go to school from Monday to Friday. Most people

don’t work on Saturday or Sunday. In England most shops are closed on Saturday and Sunday. But in

China shops are open every day. In England some people go to church (去做礼拜). The time between

Friday evening and Monday morning is the weekend. It is the time for rest. We can’t work all the time.

We have to work from time to time. We rest over the weekend.

1. Most children don’t go to school on and Sunday.

A. Saturday

B. Monday

C. Wednesday

D. Friday

2. In china shops are open .

A. every day

B. from Monday to Friday

C. every day except Saturday

D. Only at the weekends

3. The weekend is_____ .

A. from Friday evening to Monday morning

B. on Saturday and Sunday

C. from Friday to Monday

D. on Saturday or Sunday

单项选择题

正常的瞳孔表现为()

A．自然光线下直径2.5～4mm

B．手电筒直射下直径3～4mm

C．日光灯下直径2～6mm

D．自然光线下直径<6mm

E．手电筒斜射时直径<6mm