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■12問目 回答結果■
不正解！
正　解：stayed up in the air for long.

時　間：13855秒
正解数：0問

第13問目
以下の文では、最後の文が未完成です。段落の下にリストされている4つの選択肢から、適切な文を選択してください。
Some birds fly great distances every year. In the fall, they leave their homes in the north and fly thousands of miles south. Then, in the spring, they return to the north, to exactly the same place. Scientists do not really know how they do this. They believe that these birds must have .
a kind of map in their heads.

some way of speaking.

special feathers on their wings.

an especially rich diet.



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