A、
Watching birds flying.
B、
Attracting and feeding wild birds.
C、
Keeping birds and feeding birds.
D、
Watching birds and doing some research.
【正确答案】
B
【答案解析】
A、
Loving different kinds of birds.
B、
Enough money.
C、
Accurate identification of birds.
D、
Making some research about birds.
【正确答案】
C
【答案解析】
A、
Because fewer birds appear.
B、
Because birds don' t need much food.
C、
Because birds fly to remote places.
D、
Because fewer natural foods are available and air temperatures are lower.
【正确答案】
D
【答案解析】
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