首页
登录
职称英语
The deathwatch beetle is thought of as the devil’s pest in churches and old
The deathwatch beetle is thought of as the devil’s pest in churches and old
游客
2024-08-13
18
管理
问题
The deathwatch beetle is thought of as the devil’s pest in churches and old houses, but in natural habitats it infests a wide range of decaying hardwoods. It has been found in hornbeam, sweet chestnut, hawthorn, beech, ash, blackpoplar, elm, larch, spruce and yew, but the two most commonly infested species in Britain are oak and willow. In buildings, oak timbers are usually the focus of attack by the beetle, but alder, walnut, elm, larch and Scots pine can be affected too. Deathwatch beetles attack wood that has been decayed by fungi, so it is the damp-prone parts of timbers, at the ends and near leaking gutters and enclosed spaces that are normally attacked first.
Adult beetles emerge from holes in the timber in spring, or occasionally in autumn. They breed once and a week or two later the females lay eggs, usually about fifty, in small cracks on the surface of the wood. Adults depend on stored reserves; they do not feed, so the adult lifespan is largely determined by body size and metabolic demands. Emergent females rarely live for more than ten weeks, and males eight or nine weeks, at a temperature of about 20%.
The eggs hatch after two to five weeks and the larvae then wander across the wood to find suitable entry points through which to bore into the timber. Then they take between two and ten weeks to complete their development. The larvae pupate in late summer to early autumn, each individual having constructed a pupal cell just below the surface of the wood. After two or three weeks, the immature beetle emerges from the pupal skin, but then remains torpid inside the chamber until the following spring or early summer. The mature beetle then cuts a perfectly round hole, three to five millimetres in diameter, and emerges covered in a fine layer of wood powder.
SUMMARY :
The deathwatch beetle is found most often in【66】trees in Britain. They infest damp-prone timber which has been affected【67】. Adults do not feed, so they survive on【68】and live for only two or three months. The larvae, on the other hand, live for up to【69】. They pupate in late summer to autumn, but the adult does not emerge until【70】or early summer. [br]
选项
答案
oak and willow
解析
(第一段提到蛀虫会出没于很多种腐朽的硬木,但the two most commonly infested species in Britain are oak and willow,由此可得答案。deathwatch beetle蛀虫。oak and willow橡树和柳树。)
转载请注明原文地址:https://tihaiku.com/zcyy/3717815.html
相关试题推荐
Thefarmproducedmorefoodthan______thoughtpossibleduringWorldWarII.A、eve
Asaboyhewantedtobeafireman.Asahighschoolstudent,hethoughthe’dli
Thespokesmanadmittedthatthegovernment’sthoughtlesspolicyhadcausedacri
Ourmodemcivilizationmustnotbethoughtofas______inashortperiodoftime.
Tooursurprise,________lessonswerenotsodifficultaswethought.A、thefirst
Itisthoughtthatmoderncornmaybea_________ofteosinteandotherwildspeci
Thespokesmanadmittedthatthegovernment’sthoughtlesspolicyhadcausedacri
Thedeathwatchbeetleisthoughtofasthedevil’spestinchurchesandold
Thedeathwatchbeetleisthoughtofasthedevil’spestinchurchesandold
他想起了母亲,才鼓足了勇气继续干下去。(thethoughtof)Onlythethoughtofhismothergavehimthe
随机试题
总包单位应对承揽分包工程的分包单位进行资质、安全生产许可证和相关人员安全生产资格
若某男性,体重80kg,以每小时4km的速度快走50分钟,代谢当量为3kcal/
IIS6.0可以通过添加Windows组件的方式进行安装,包括它的组件是( )
干片式生化分析仪是将一项测定中所需的全部或部分试剂预固定在载体中,要计算出待测物
成套房屋建筑面积通常是指( )。A.分层建筑面积 B.分户建筑面积 C.分
关于糖浆剂,叙述正确的是A.糖浆剂系指含药物或芳香物质的蔗糖水溶液 B.糖浆剂
振兴村2019年集体资产经营与财务收支业务如下: (1)1月,该村通过清产
(2020年真题)甲公司系增值税一般纳税人。2×20年1月10日购入一台需安装的
(2012年真题)竣工决算文件中,真实记录各种地上、地下建筑物、构筑物,特别是基
(2018年真题广东海南)热轧钢筋的焊接接头应优先选择()。A.电弧焊 B
最新回复
(
0
)