首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The deathwatch beetle is thought of as the devil’s pest in churches and old houses, but in natural habitats it infests a wide ra
The deathwatch beetle is thought of as the devil’s pest in churches and old houses, but in natural habitats it infests a wide ra
admin
2011-01-05
61
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.
选项
答案
by fungi
解析
(见第一段最后一句。fungi真菌。)
转载请注明原文地址:https://kaotiyun.com/show/aHAK777K
本试题收录于:
B类竞赛(英语专业本科专科)题库大学生英语竞赛(NECCS)分类
0
B类竞赛(英语专业本科专科)
大学生英语竞赛(NECCS)
相关试题推荐
Haveyoueverthoughtaboutinventingsomething?Wereyouworriedthatyourideawastoostrangeorunrealistic?Well,maybeyou
Thesedays,collegelecturehallsintheUnitedStatesarebeingfilledmoreandmorewithfemaleratherthanmalestudents.Wom
A.SettingandstoryB.TitleC.ReasonsforrecommendingitD.Directorandstars42.______Thisweek,AnaPetrovichreviewedU
A.SettingandstoryB.TitleC.ReasonsforrecommendingitD.Directorandstars42.______Thisweek,AnaPetrovichreviewedU
SummaryListentothepassage.Forquestions26-30,completethenotesusingnomorethanthreewordsforeachblank.Ele
SummaryListentothepassage.Forquestions26-30,completethenotesusingnomorethanthreewordsforeachblank.Ele
SummaryListentothepassage.Forquestions26-30,completethenotesusingnomorethanthreewordsforeachblank.Ele
Ifthereisanysingle【21】thatmakesforsuccessinliving,itistheabilitytoprofitbydefeat.EverysuccessIknowhasbeen
Thewardenledusinsinglefilealonganarrowlineofpaving-slabsthatranpastthehuts.Everysooften,fourstepsledtoa
随机试题
管理层对编制财务报表的责任具体包括()
A、是氧化锌丁香酚水门汀的基质并伴有消毒收敛作用B、可增加氧化锌丁香酚水门汀的粘附性与韧性C、可增加氧化锌丁香酚水门汀的强度,促进固化D、作为氧化锌丁香酚水门汀的另一类基质材料与氧化物反应E、能加速氧化锌丁香酚水门汀的固化丁香油
结核性腹膜炎治疗中,哪些情况使用激素需慎重
A.维生素Bl缺乏B.维生素B2缺乏C.维生素E缺乏D.维生素A缺乏E.维生素D缺乏鸡“小脑软化症”
骨折与脱位均具有的特殊体征是
采用维卡仪测定水泥初凝时间,以试针距底板的距离为()作为水泥净浆达到初凝状态的判定标准。
构筑物的满水试验,向池内注水应分( )进行,每次注入深度为设计水深的1/3。
下列哪项在内部控制风险评估程序担当重要的角色,他们应采取措施对可能影响整个企业的风险,以及不同的组织活动或实体所面对的风险进行评估()。
复制数据、子集数据和重组数据中的数据,相同的内容可以存放在两个或者更多的机器中,这样保持【】是设计的重要问题。
A已经写了一个晚上了,你累了吧?B是的,感觉有点儿冷。C我常常10点睡觉,但是最近要考试了,所以晚一点儿。D我最喜欢打篮球,也很喜欢游泳。E这里的咖啡好喝吗?F当然。我们先坐公共汽车,然后换地铁。例如:你知道怎么去那儿吗?(F)你都
最新回复
(
0
)