一、答案
| 1 | 2 | 3 | 4 | 5 |
| C | B | C | A | B |
二、答案
1. cold
2. heaviest
3. tourists
4. smaller
5. most popular
三、答案
1. shorter than
2. the tallest
3. What is
4. How high
5. What's the population
四、答案
(1) were
(2) sang
(3) longest
(4) first