2.试验中，把hammer head shark和其他类型的shark放在一个wire connected pool里，所有的shark对于猎物的感知度一样，hammer head shark并没有体现出更高的敏感度
Independent writing task
Some people think that older children should be required to take care of the younger children. Others think that this should be done by parents or other adults. Which do you prefer?
From my perspective, older brothers should take the responsibility to attend to the younger children. Supporting idea: 1. older children would be capable of dealing with younger children’s problems both from school and life 2. this can reinforce the relationship between siblings
In addition, this can reinforce the relationship between siblings. As is known to all, many families are confronted with a problem that children are not in harmony with each other. For example, a classmate of mine in high school always fought with his brother often due to some tiny issues. This phenomenon results from the fact that present children are more selfish than before. They are reluctant to share. Nevertheless, suppose the older children offer to take care of their younger brothers, the younger one will in turn, be grateful for that. Therefore, the relationship between siblings can be strengthened.