资料题：A female mosquito bites you but not others, it's because（  ）。

No matter who you are or where you come from, one thing is certain; you are acquainted with the mosquito, although you probably wish you weren't.Mosquitoes are everywhere.They can be found all over the world, and they come in more than 2, 500 species.Somewhere, at some time, you have surely met at least one.No one loves the mosquito.But unfortunately, the mosquito may decide that she loves you.She? Yes, she.Did you know that only the female mosquito bites? Well, it's true.And it's not because she's unfriendly; she needs blood to reproduce.Do you know how the female mosquito decides whom to bite? She's quite selective, and shechooses her victims carefully.First, she uses sensors to find her victim.These sensors are located on her two antennae and her tree pairs of legs.With these sensors, she tests your body moisture, body warmth, and chemical substances in your sweat.If she likes what she bites, she bites.But if you don't appeal to her, she'll reject you for someone more appetizing.The next time a mosquito bites you, just remember that you were chosen.You're special.If the mosquito likes you, she settles onto flesh very gently, and she breaks your akin with her proboscis(鼻子) tip.Proboscis tip? What's that? I's kind of mouth and it sticks out just below the mosquito's eyes.It contains six sharp instruments called stylets(探针).She stabs all six styles into your akin a once, and if she hits a blood vessel, she'll get a full dinner in about a minute.All this usually takes place 8o quickly and quietly that you may not have suspected anything was happening.Why does a mosquito bite itch? The itch is not really from the bite.It's from the saliva the mosquito mixes with your blood to keep it from clotting as she sucks it up her proboscis tip.By the time the itching begins, she has gone.And then what happens? Well, after her delicious diner, the mosquito is tired.She just wants to find a place to rest.Heavy with your blood, she picks a spot- on a leaf or a wall or a stone to quietly lay her eggs.Just one drop of blood will produce hundreds of eggs.Where is her mate? Well, their relationship is over, and he's no longer around.Their mating took place before she bit you.She will live one to two months and lay eggs four or five times during this time.All mosquitoes, male and female, pass through their early stages of development in or nearwater.In fact, mosquito eggs will not hatch without water, although the eggs can survive p to five years on dry land waiting for water.It is not surprising that heavy rains produce large numbers of mosquitoes.But why? Why did nature bother to create mosquitoes? Just to annoy us? Probably that wasn't the main reason.Male mosquitoes live on the nectar of flowers, and 8ome scientists believe that they pollinate the flowers as they fly from one to the other.0f course, mosquitoes have to reproduce, and unfortunately hat's where you and I come in.Like it or not, mosquitoes are here to stay.Ouch! (Slap!) One just bit me!