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
44
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
【B1】[br]【B9】A、leaB、sentC、boughtD、wastedAleave意为“离开,动身,剩下,遗忘”;send意为“送,寄;发送
Howwedie,aswellashowwelive,hasprofoundandlastingeffectson
Asurveyof16to24yearoldshasfoundthat75%ofthemfeeltheycouldn’t
A.清蛋白 B.α球蛋白 C.α球蛋白 D.γ球蛋白 E.β球蛋白肝脏合
患者男性,15岁,检查:恒牙,第一磨牙关系呈中性,上下颌尖牙唇向低位,无间隙。上
阀控蓄电池组正常应以浮充电方式运行,浮充电压值应控制为(____)V×N。2.2
在市场机制作用下,如果居民和企业作为市场主体分别实现了效用最大化和利润最大化,并
廉租住房的保障对象是()。A.城市中等偏下收入家庭 B.夹心层及外来务工人员
半夏厚朴汤中配伍苏叶的用意是( )。A.宽中除胀 B.理肺疏肝 C.和胃止
城镇土地使用税的纳税人不包括()。A.土地的实际使用人 B.农用耕地的承
最新回复
(
0
)