(5分)图5是某家族成员的关系图谱。请据图回答: (1)4的性染色体组成为XY

题型:实验题

问题:

(5分)图5是某家族成员的关系图谱。请据图回答:

(1)4的性染色体组成为XY,其中Y染色体来自_      ___(1或2)。

(2)假设控制双眼皮的基因(A)为显性,控制单眼皮的基因(a)为隐性。若5和6生来就是双眼皮,9有可能表现为单眼皮吗?                 

(3)若7和8是一对龙风胎,他们属于              (直系/旁系)血亲。其中8的体细胞染色体组成为                             

(4)7和9是近亲关系,他们携带同一致病基因的可能性较大。请你从优生的角度,说出他们不能结为夫妻的原因:                                                         

考点:基因经精子或卵细胞的传递基因控制生物的性状生殖过程中染色体的变化基因的显性和隐性
题型:实验题

一列简谐横波在x轴上传播,某时刻的波形图如图所示,abc为三个质点,a正向上运动,由此可知(  )

A.该波沿x轴负方向传播

B.该时刻以后,b比c先到达平衡位置

C.c正向上运动

D.该时刻以后,b比c先到达离平衡位置最远处M

题型:实验题
On a cold November afternoon,my mother and 1 were walking home from a   21  .We were dressed   22  .1 was feeling a little   23 as 1 was carrying our shopping,and decided to throw away something.So I started to walk towards a   24 when I noticed a poor man walking out of the restaurant in front of us.He   25  over to another nearby dustbin and started looking through it.
I suddenly felt very guilty because 1 was about to throw away a new drink just because it was
  26 .1 walked up to him and handed the   27  and some snacks over to him.The man looked up   28  and took what I gave him.
A huge smile   29  across his face and this   30   me to feel indescribable satisfaction.I felt I couldn’t be happier   31  myself.But then he said:“Wow,this is my son’s lucky day!”
With that,he thanked me happily and started off on his bike,I    32  heard him whistling a song as he rode away.
I got a warm  33 inside.I now understand  34 is meant by the saying “giving is getting”.
Although it only   35  a little action and a few words,I gained and learned more in those two minutes than I did in the rest of the month.Everyone in the world needs   36  ,everyone can   37  help and everyone will be helped by   38  kindness.
The image of that man’s happiness caused by my small gift appears in my mind every   39 I have the chance to do something nice.
This is the   40   of charity.
小题1:
A.storeB.schoolC.hospitalD.factory
小题2:
A.poorlyB.coldlyC.warmlyD.expensively
小题3:
A.gladB.interestedC.boredD.tired
小题4:
A.streetB.dustbinC.toiletD.corner
小题5:
A.walkedB.lookedC.thoughtD.took
小题6:
A.cheapB.heavyC.tastelessD.full
小题7:
A.moneyB.toysC.drinkD.clothes
小题8:
A.in silenceB.in surpriseC.in interest D.in a hurry
小题9:
A.spreadB.cameC.wentD.ran
小题10:
A.forcedB.helpedC.madeD.caused
小题11:
A.withB.toC.atD.for
小题12:
A.stillB.neverC.evenD.ever
小题13:
A.opinionB.mindC.ideaD.feeling
小题14:
A.whichB.whatC.thatD.it
小题15:
A.costB.tookC.spentD.asked
小题16:
A.1oveB.moneyC.helpD.drink
小题17:
A.giveB.sendC.offerD.have
小题18:
A.showingB.expressingC.1endingD.saying
小题19:
A.momentB.dayC.minuteD.time
小题20:
A.aimB.meaningC.strengthD.power
题型:实验题

男性,58岁,心肌梗死史1年,每天吸烟约10支,近1周劳累时发作胸痛,每次持续5~10分钟,来就诊,为预防胸痛发作,医生应告诫遵守下列各项除外()。

A.戒烟

B.避免剧烈活动

C.减轻体重

D.作蹬车试验

E.服用消心痛

题型:实验题

土壤生态型分类中以pH8~9为碱性土,喜碱性土树种有杜英、银杏等。

题型:实验题

双母线差动保护中,一、二母线相继发生短路故障,不能反应后一母线故障的母线保护是()。

A.元件固定联接的母线完全电流差动保护

B.比较母联电流相位构成的母线差动保护

C.比率制动式母线差动保护

D.以上均不正确

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