a. 户内的, 室内的

◆记忆方法一：
词根词缀记忆法：indoor户内的（in+door门→门内的）,“im-,in-”表示“向内，进入”

• sport用作可数名词单数时指具体的某项运动，如： Basketball is an indoor sport. 而在泛指"运动"或"运动会"时要用其复数形式sports.
  
  ［误］ Are you going to run in the school sprot?
  
  ［正］ Are you going to run in the school sprots?
  
  ［析］ sport用作可数名词单数时指具体的某项运动，如： Basketball is an indoor sport. 而在泛指"运动"或"运动会"时要用其复数形式sports.

income/earning/pay/salary/wage/outcome/indoor/indoors/outdoor/outdoors
记忆：
1. income [ 5inkEm ] n. 收入, 收益 He has a considerable income every month. 他每个月有可观的收入。
2. earning n. 所赚的钱, 收入 His poor earnings can hardly support the family. 他微薄的收入几乎不能支撑这个家。
3. pay n. 薪水, 工资 v. 支付, 交纳 Working in telecom, he gets a high pay. 因为在电信部门工作，他的薪水很高。
4. salary [ 5sAlEri ] n. 薪水 Few people have no desire for high salaries. 很少有人不想得了高额薪水。
5. wage [ weidV ] n. 工资 v. 发动 The railroad workers have asked for a wage increase. 铁路工作已经要求提高工资。
6. outcome [ 5autkQm ] n. 结果, 成果 The outcome was disastrous, unfortunately. 不幸的是，结果是灾难性的。
7. indoor [ 5indC:] adj. 户内的, 室内的 Which do you prefer, indoor sports or outdoor sports?室内运动和室外运动你更喜欢哪一种？
8. indoors [ 5in5dC:z ] adv. 在户内 We like to do sports indoors. 我们喜欢做室内运动。
9. outdoor [ 5autdC:] adj. 室外的, 户外的, 野外的 Staying in the classroom so long, we hope to hold some outdoor activities. 在教室里呆久了，我们希望举行一些户外活动。
10. outdoors [ aut5dC:z ] adv. 在户外, 在野外 Without a tent, we had to spent the night outdoors. 我们没有帐篷，只好在户外过夜。
另类阅读：
With the wages raised, we have more income every week. We can pay for our indoor decoration now. If your company increases your salary, we will have more earnings every month and can take part in more amusements outdoors. We will be very delighted with the outcome.