奇速英语

Have you ever been mad at the buzzing sound of a mosquito flying close to your ear? If you have, then you can be sure ____1____ it was in fact a female mosquito. Female mosquitoes need to feed on the blood of birds, reptiles, people and other mammals. They need something from the ____2____ to produce their eggs.

How do mosquitoes find us? When hunting for a meal, a mosquito senses ____3____ kinds of signs that suggest a human is nearby. The signs ____4____ CO₂, the smell of your skin and body heat.

First, a mosquito’s taste sensors (传感器) find the CO₂ you give off as you breathe out. And it can sense this gas from quite the distance, upwards of 50 feet (英尺) but maybe even as ____5____ as 100 feet. Drawing closer, its smell sensors are looking for the ____6____ of your skin. And as the mosquito draws even closer, it senses your body heat to find you at last. After ____7____ on you, it uses taste sensors in its legs to find the right place to bite (咬) you and, well, you know how the rest ____8____.

How are mosquito bites treated (治疗)? Mosquito bites usually don’t ____9____ treatment. Mosquito bite creams (膏) can relieve the discomfort caused by mosquito bites. However, you had better see a doctor if you experience great discomfort and have ____10____ visited a place where mosquito-spread infections (感染) are common.