Ⅰ、1 - 5 A B C C A
6 - 10 D D C B C
11 - 15 A C B B D
Ⅱ、16 - 20 A C D D B
21 - 25 A B D A B
Ⅲ、26 - 30 B C A C C
31 - 35 D D D C B
36、Taking regular walks helps older people pay attention better than if they didn't exercise.
37、Mice are tested in previous research.
38、41 adults were tested.
39、Going for a walk every 2 or 3 days for just 10 to 45 minutes can be good news for grandparents.
40、Yes,it can.
Ⅳ、41、country
42、stayed
43、meeting
44、nobody
45、hungry
46、remembered
47、think
48、order
49、nothing
50、around
Ⅴ、One possible version:
My classmate,Maggie,hardly ever does housework.She does her homework three hours every day.Once a month she goes camping in the country.She hardly watches TV.But she uses the Internet once a week.Every day she does some reading.She often does sports.She exercises five times a week and goes to the movies once a month.