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
43
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:http://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
Theboysinthedorm______acointodecidewhowouldcleanthefloor.A、heldB、to
驾驶机动车在高速公路行驶过程中,发现前方有动物突然横穿时,可以采取急转向的方式避
集中突出一个主题的版面被称为()A.重点式版面 B.集中式版面 C.综合式
细菌性阴道病的特征哪项正确( )A.与不洁性生活无关 B.氨臭味试验阴性
男性,60岁,肥胖,颈后长一痈,伴高热,需切开引流,空腹血糖250mg/dl,尿
肝硬化水湿内停证的治法是()(2001)A.滋养肝肾,育阴利水 B.温
3岁腹泻患儿,补液中出现低血钾,现剩余液体500ml,最多可加入10%氯化钾A.
女性,45岁,患者头痛2周,加重2天,疼痛呈持续性,以前额及两颞部疼痛为主,眠差
患者女,40岁。患乳腺癌准备行乳腺癌根治性手术。术前患者最关心的健康宣教内容是A
A.ab不动而突然撤去磁场 B.ab不动而突然增强磁场 C.ab匀速向右运动
最新回复
(
0
)