3．
| A.putting B.since C.danger D.as E.taking care of F.safety |
Do animals feel love？Maybe.Maybe not.There're many signs of animal love in nature.Or，at least，there seem to be.They include mothers（1）
their babies，or even family groups protecting one another from（2）
.One scientist has made a discovery （發(fā)現(xiàn)）.The brains of some animals produce chemicals that are seen in human brains.In our brains，these chemicals are responsible （負(fù)責(zé)的） for the feeling of love.But some scientists doubt （懷疑） that animals really"feel" love.They say that we're just（3）
our own feelings on the animals.We expect animals to love and protect their young babies（4）
we do.But these scientists say animals do these things without any reasons.They say animals have no feelings.They only have natural behaviours（5）
they were born.
