Plant species are dispersed over a large area with the help of______.

A．They were born to be pale.
B．They did not like traveling in sunny countries.
C．They wanted to be different from the peasants.
D．They thought light color was the color of health.

A．They are looking for an apartment to live in.
B．They are discussing living places and children’s education.
C．They are complaining about their children.
D．They are planning for the next weekend.