第二节 跨学科生物 阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。选项中有一项为多余选项。（每小题1分，共5分）
In the 1960s，a volcanic island(火山岛）named Surtsey made its appearance in the south of Iceland. 11.
C
It gave them a special chance to find out how life began on a piece of new land.
In the past，scientists believed that only plants with certain special features could reach faraway new places and grow there. In their opinions，plants needed to have very light seeds(种子）that could be carried by the wind，or they needed to have eye-catching fruits that could easily catch the attention of animals and then be eaten by them so that their seeds could spread over long distances.
12.
D
Researchers carried out the study on Surtsey and made an interesting discovery—most of the plants on the island did not have those special features.
13.
B
It turned out that birds were the main helpers. These birds flew between the mainland and Surtsey. They played the leading role in bringing seeds to the island—carrying them inside their bodies or in their droppings(粪便）. These seeds then grew into new plants on the island. With the interaction，many plants reached the island and formed a healthy ecosystem there. 14.
F
The interaction between plants and birds matters a lot too.
Birds are the real heroes for plant spreading. They help plants move from one place to another. 15.
A
After all，if they get into trouble，plants will lose their best “drivers”.
A. We must keep the birds safe.
B. How did the plants reach the island?
C. For scientists，this was an exciting event.
D. However，a study has challenged this idea.
E. Seeds travel in different ways to start new plant lives.
F. This clearly shows that life doesn't just spread by plants themselves.
