Does my goldfish know who I am？ I think this is a great question.I do spend my days（1）

studying

studying

（study） how fish go about their lives.First of all，fish are much smarter than people think.People often talk of goldfish having three-second（2）

memories

memories

（memory），but in fact they can learn all kinds of things，and remember them （3）

for

for

quite a long time.
    This shouldn't surprise us too much.Just like other animals，they can find enough to eat，and （4）

know

know

（know） when it is safe to be out in the open.Being able to learn and remember things helps（5）

them

them

（they） do this.
    Many kinds of fish can tell one from another，according to their group，their relatives，（6）

and/or

and/or

even their own eggs.But fish live in（7）

a

a

very different world from us.For many kinds of fish，although seeing is important，sense（感官） such as smell and touch are even more important.
    So，does your fish know who you are？I believe your fish will（8）

surely

surely

（sure） know when it is feeding time.My own fish become very（9）

excited

excited

（excite） when my hand appears near their tank（魚缸），even before I drop the food in.I'm not sure that your fish will be able to remember what your face（10）

looks

looks

（look） like，but I wouldn't be too surprised if it could remember you in other ways，perhaps by the sound of your footsteps as you walk towards the tank.