Scientists have always believed that snails are not able to find their way home. But Briton Ruth Brooks, a retired teacher, has found that it is not true.

    Brooks began an experiment on snails after she got mad with the snails in her garden.

    The snails had eaten her vegetables. She didn't want to kill them, so she took them to another place. But she found they always seemed to come back.

    Brooks did an experiment. She marked the snails in her garden with nail polish(指甲油).

    She placed the snails in the area around her home and made notes of their movements.

    She found that snails have a strong homing instinct (本能); the longest returning snail traveled back 90 meters. Brooks has been named Britain's best amateur (业余的) scientist after her work won the BBC Radio 4 project, So You Want To Be A Scientist.

    She said, "I've always wanted to know whether the snails that eat my plants just come back when I move them, and if they do, what is their homing distance?

    "I would say on the evidence (证据) that it would be safe to take your snails away beyond 100m or even further. If you put them somewhere nice with some food, you can be almost certain that they won't come back."

把盒子放到椅子上。可以说：

B: It's over there on your right.

改革开放以来我国在对外贸易中受益匪浅，外汇储备跃居世界第一：中国的贸易对手也从中获利，“中国制造”给欧美国家消费者带来诸多方便和实惠。这说明（    ）

①合作可以互惠互利，共享成果    ②合作就是竞争，竞争就是合作

③发展离不开合作                            ④竞争只能导致两败俱伤