2024届高三天一大联考下学期开学质量检测英语

高三历次考试关注度都比较高，参考价值较大，为更好地帮助2023-2024学年高三师生有效提升各学科备考复习效率，了解各科考点，小编在下文整理了高三各科试题及答案汇总，供大家对照参考!

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In October，Mediterranean fruit flies were discovered in an area of Los Angeles. California is a big farming state，and this was serious news for farmers. The Mediterranean fruit fly，often known as the“Medfly”，is one of the most serious threats faced by farmers worldwide. Once the Medfly makes its way into an area， it can be very hard to get rid of.

The fies lay their eggs in over 300 kinds of fruits and vegetables. When the eggs hatch，they turn into worm-like larvae( 幼虫) that can ruin these products. The problem is that it can be hard to know that the flies are there until it' s too late. That' s because the fruits and vegetables still look normal even after the eggs are laid inside. So the damaged fruits and vegetables can be sent to other places， allowing the Medflies to spread.

Mediterranean fruit fies were first found in California in 1975，but they really became a problem in the 1980s. Luckily，Califormia has developed a program to control the Medflies. The program involves using planes to drop millions of Medflies over the area. That may sound like a bad idea，but it' s actually a tricky way to make sure that Medfly numbers go down.

The trick? The airplanes only drop male flies ，and all of them have been treated so that they are sterile. This means that even though they can mate with female fruit flies， the eggs produced will never grow or hatch.

In the early growing stages， these sterile flies are grown in labs in Hawaii and Guatemala. The insects are colored with a special substance to make sure they won't be confused with wild Medflies.

These immature insects are then sent to Califormia in huge numbers -around 200 million a week. They' re raised until they' re adults， and then they' re treated to be sterile. Finally ， the flies are released from airplanes，sing a special method designed to spread them out over a wide area. The government says that the number of infestations (times when flies are found) has been cut by over 90%.

2024届高三天一大联考下学期开学质量检测英语