下列有关生物学实验的叙述正确的是（ ）

某兴趣小组设计了如图甲所示的汽车转向指示灯电路模型，接通相应指示灯后，该指示灯会亮、暗（微弱发光）交替闪烁发光，电路中电源电压恒为6伏，指示灯规格为“6V 3W”，R₀为定值电阻，电磁铁线圈及铁的阻值忽略不计。

（1）若让左转、右转指示灯同时工作，转向开关应与触点　3和4　接通。（选填“1和2”、“2和3”、“3和4”或“4和5”）

（2）当转向开关与触点“2和3”接通时，右转指示灯两端实际电压变化规律如图乙所示。已知当右转指示灯微弱发光时，其两端实际电压为U，消耗的实际功率为额定功率的$\frac{1}{25}$

求：①右转指示灯闪烁交替工作30秒消耗的电能；

   ②定值电阻R₀的阻值（指示灯的电阻不变）。

根据短文内容, 选择正确答案。

There are many holidays and festivals. Dads have Father's Day. Children have Children's Day. Is there a special day for old people?

Double Ninth Festival is a special day for old people in China. It started long ago. The festival is on lunar September 9th. This year it is on October 13th. On this day, people show love for their grandparents.

People do many different kinds of things on this day. They enjoy flowers, eat special cakes and drink wine(酒).

      It's very interesting. The best way to celebrate it is climbing hills or mountains. People think climbing will bring them good luck and help old people live long lives. Double Ninth Festival is also a good time for a family get-together. And young people give their presents and best wishes to the old.

阅读下面文言文，完成下列各题。

桃花源记

陶渊明

    晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之。复前行，欲穷其林。

    林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田美池桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。

    见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”

    既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。