闭合开关S后，通电螺线管与磁极间的磁感线形状如图所示，请在图中用箭头标明磁感线的方向，并画出螺线管的绕法．

根据短文理解，从A、B、C三个选项中选择最佳答案填空。

    Ebola (埃博拉) is a river in Africa. In 1976, a 1 virus (病毒) was found there. The virus can cause people to get very sick and even 2. So people call the virus Ebola.

    Last year Ebola caused the worst problem in western Africa, and 3 spread very quickly. Medical experts all over the world did their best to stop Ebola and to treat the people who were sick.

    Ebola 4 starts with fever and headache, kind of like the flu. But it can get worse and cause serious bleeding and 5 problems. It's very important tor infected (受感染的) people to get treatment right away. People who have Ebola need to be cared for in a special way 6 the illness doesn't spread to doctors, nurses or others in their families.        

    Doctors aren't sure how the 7 person got Ebola, but they think people picked up the virus from infected animals. People can get the virus by touching an infected person's drops of 8. But Ebola doesn't spread through food or water like some viruses 9. It also doesn't travel through the air like cold or flu viruses do. In areas where the Ebola virus is, anyone who doesn't feel 10 should get medical held immediately.

重点段落品析。

    朱德同志也跟战士们一块儿去挑粮。他       草鞋，       斗笠，      粮食，跟大家一块儿爬山。白天挑粮爬山，晚上还常常整夜整夜地研究怎样跟敌人打仗。大家看了心疼，就把他那根扁担藏了起来。不料，朱德同志又找来一根扁担，写上“朱德的扁担”五个字。

GPS的应用有陆地应用、____和航空航天应用。

如图为人体血液循环示意图和尿液形成示意图．请据图回答下列问题：

（1）某人患膝关节炎，医生采用上肢静脉输液的方法进行治疗．输液一段时间后，在患者尿液中也检测到药物．根据上图，请指出血液中的药物排出经过的途径是：上腔静脉→____ →右心室→肺动脉→肺内毛细血管→____ →左心房→左心室→主动脉→肾动脉→____ →____ →肾小管→收集管→输尿管→膀胱→尿道→体外．

（2）医生对该病人进行输液治疗的同时，还给病人开了口服中药进行治疗．请问中药有效药物成分最先进入本题血液循环示意图的____ （填图中血管名称）．

（3）医生对该病人进行上述方法治疗的同时，还用一种中药膏外敷在病人的膝关节，并用一种可以发热的灯具对着膝关节进行烘烤．请问这种外敷的中药膏中的药物有效成分是如何穿透皮肤进入发病部位的？____ ．

（4）上述用发热的灯具对着膝关节进行烘烤对治疗关节炎有何作用？____