尋求《英語世界》老師們的幫助。謝謝先！

一朋友在ESL學英語。在昨天下發的家庭作業裏有一道詞匯練習題。要求將下列單詞分成三組：1. 須用冠詞a/an，2. 須用冠詞the，3. 不須用冠詞。由於是醫學詞匯，平時使用極少。如何答題，不得而知。故來此尋求幫助。望英語大咖們不吝賜教。謝謝先。
1. cold
2. flu
3. AIDS
4. cough
5. hiccups
6. cancer
7. cut
8. measles
9. diarrhea
10. eye infection
11. dry skin
12. fever
13. insomnia
14. headache
15. malaria
16. stomachache
17. sore throat
18. toothache
19. sunburn

所有跟帖： 

• 歡迎新同學！ -妖妖靈- ♀ (0 bytes) () 10/16/2021 postreply 10:52:04

• +1:) -青鬆站- ♀ (0 bytes) () 10/16/2021 postreply 11:05:39

• Seems a/an,or the ,applies to all,at first glance-;)) -青鬆站- ♀ (0 bytes) () 10/16/2021 postreply 12:42:06

• I didn't seem to see any particular one that needs to use "The". -甜蟲蟲- ♀ (125 bytes) () 10/16/2021 postreply 12:49:05

• 看了一下，好像沒有需要用The的 :) -甜蟲蟲- ♀ (5471 bytes) () 10/16/2021 postreply 12:45:47

• 我在Flu前會用the，但很多人不用。 :) -ibelieu- ♀ (806 bytes) () 10/16/2021 postreply 13:47:29

• It seems like "A flu", "The flu", and just "Flu" are all OK :) T -甜蟲蟲- ♀ (0 bytes) () 10/16/2021 postreply 14:06:32

• Yes, they just want to confuse people. :) -ibelieu- ♀ (0 bytes) () 10/16/2021 postreply 14:17:32

• 謝謝大家！ 這裏是老師提供的參考答案。 -那是老劉的意思- ♂ (497 bytes) () 10/16/2021 postreply 17:30:04

• Do we really need "The" in front of "measles" and "hiccups"? -甜蟲蟲- ♀ (0 bytes) () 10/16/2021 postreply 21:21:48

• Honestly that sounds strange to me. :) -甜蟲蟲- ♀ (0 bytes) () 10/16/2021 postreply 21:22:57

• 也許周一可以找老師問問。有結果一定回饋你。 -那是老劉的意思- ♂ (0 bytes) () 10/17/2021 postreply 04:30:23

• 網上就能找到答案，譬如這些： -ibelieu- ♀ (262 bytes) () 10/17/2021 postreply 09:54:03

• good point -移花接木- ♂ (0 bytes) () 10/16/2021 postreply 17:38:26