首页
登录
职称英语
[A] Since wind-pollinated flowers have no need to attract insects or other a
[A] Since wind-pollinated flowers have no need to attract insects or other a
游客
2024-01-02
45
管理
问题
[A] Since wind-pollinated flowers have no need to attract insects or other animals, they have dispensed with bright petals, nectar, and scent. [B] The result is insignificant-looking flowers and catkins (dense cylindrical clusters of small, petal less flowers). [C] Wind pollination does, of course, require a lot of pollen. [D] Birch and hazel trees can produce 5.5 and 4 million grains per catkin, respectively. There are various adaptations to help as much of the pollen go as far as possible. Most deciduous wind-pollinated trees (which shed their leaves every fall) produce their pollen in the spring while the branches are bare of leaves to reduce the surrounding surfaces that "compete" with the stigmas (the part of the flower that receives the pollen) for pollen. Evergreen conifers, which do not shed their leaves, have less to gain from spring flowering, and, indeed, some flower in the autumn or winter.
Look at the four squares [■] that indicate where the following sentence could be added to the passage. These are at best a waste and at worst an impediment to the transfer of pollen in the air.
Where would the sentence best fit?
选项
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3327682.html
相关试题推荐
Whydoyouthinksomepeopleareattractedtodangeroussportsorotherdang
NotonlyAarerhododendronsknownforBtheirdramatic,colorfulflowers,Candth
[A]Sincewind-pollinatedflowershavenoneedtoattractinsectsorothera
Holidayresortsusuallyattracttouristsbecauseoftheirsunnybeaches,snow-co
Ifcauliflowersarenot______fromextremetemperatures,theheadsgetdiscolor
TheeasternbluebirdisconsideredthemostattractivebirdnativeofNorthAmer
Theflowersinthevaseshriveledbecausetheyhadn’tbeenwateredforaweek.A、
Thenewspaperstoriesdeliberatelyputdowntheactress’sunattractivepast.A、ac
Whichofthefollowingsentencesiscorrect?A、Thefamilysentfaithfullyflowers
TheeasternbluebirdisconsideredthemostattractivebirdnativeofNorthAmer
随机试题
Hesaidtherewasnothingtobe______.A、ashamedB、ashamedinC、ashamedofD、asha
Whilesomeinternationalcouriersareshowingsignsofexhaustion,EMS(Expr
Itwasyourfancyideas______gavemetheinspirationtoconceivemynewnovel.A、
Theinkisbarelydryonthedeal.ButtheagreementonChinajoiningtheWor
右肾盂内结石直径2.0cmA.肾切除术 B.非手术治疗 C.肾实质切
女,24岁,今日发现左膝关节疼痛,行走困难,休息缓解。查体:左膝关节活动稍受限,
下列哪个与尼群地平不符A.不溶于水 B.分子中有两个手性碳 C.临床用于治疗
2.5岁小儿正常心率是()。A.120~140次/分 B.110~130次
A.密度增高的条索状阴影 B.肿块状阴影 C.边缘锐利不整、密度高的斑点状阴
我国“神舟一号”实验飞船成功发射的时间是()。A.1999年 B.200
最新回复
(
0
)