果树能产生种子，种子可以萌发并长成新的植物体，这说明（    ）

    It's Sunday. Wei Fang and Meimei are on their 1 to the zoo. They are waiting for a 2at the bus stop. Wei Fang 3something on the ground. She picks 4up. Oh, it is a new watch. “5 is it?” They 6the people at the bus stop. But they don't know. “ Let's wait for the owner.” Meimei 7. They wait and wait, but the owner 8come. So they have to give 9to a policeman nearby. The policeman says, “10 good girls you are!”

当今世界，各国之间激烈的经济竞争和科技竞争，归根到底是        的竞争和       的竞争。（    ）