( ) 1. Which can be a reason for migration according to Paragraph 1?
A. Raising their babies.
B. Enjoying the journey.
C. Sending food to others.
D. Taking care of the old.
( ) 2. What problem may the birds meet when flying from Lake Poyang to Siberia?
A. There is no grass growing along the way.
B. The climate on the way becomes colder than before.
C. Fewer natural wetlands are left for them to find food.
D. Some of the birds set out early and eat too much grass.
( ) 3. How did the birds adapt to the environment they passed through?
A. By changing their diets.
B. By changing the way they flew.
C. By making their homes in wetlands.
D. By making friends with farmers.
( ) 4. What can be the best title of the passage?
A. Stop killing, stop polluting
B. Save water, save life
C. Birds help harvesting work
D. Farming and migrating