题干

病毒疫苗和抗血清在现代免疫学预防、治疗中有重要作用。下列分析正确的是(   )

A:消灭人体内病毒只需B淋巴细胞和T淋巴细胞参与

B:一个成熟T淋巴细胞的细胞膜上只有一种抗原的受体

C:人体接种病毒疫苗获得相应免疫力属于被动免疫

D:以抗血清治疗病毒性重症患者属于二次免疫

上一题 下一题 0.0难度 选择题 更新时间:2020-01-17 01:15:35

答案(点此获取答案解析)

B

同类题5

阅读下面短文,掌握大意。然后从A.B.C.D四个选项中选出最佳选项 
I was waiting for the bus when I met the woman. “You look   26  . Come and sit here,” she said. “ 27   are you going?”
“I don’t know. I just want to catch a  28    and see what it will be like at the end.”
“I’m afraid you’ll see  29   there. Why don’t you enjoy the sights on the way?”
“How can I do that while my heart’s   30   ?” I asked sadly. My best friend had left me.
The woman seemed to understand my feeling. “Don’t cry, little girl. I’ve had a similar experience to you. Thirty-five   31   ago, my husband left our three children and me. I was deadly sad. I decided to kill myself and the children, so I took    32   to the sea.   33  ,they seemed to know what would happen, so they   34   loudly. Their cry suddenly woke me 35   . How could I  36    my hope to live for one of life’s problems? After that, I worked hard to raise the children. Now they all live   37    and one of them has his own family.
Then the woman gave me a   38  , “We should never wait for the door to   39     before us. We should find the key to the  40   or try to find another way”
The bus came and I got on it with a smile
【小题1】
A.tired
B.excited
C.happy
D.well
【小题2】
A.What
B.How
C.Where
D.When
【小题3】
A.train
B.bus
C.boat
D.plane
【小题4】
A.nothing
B.everything
C.something
D.anything
【小题5】
A.smiling
B.breaking
C.singing
D.dancing
【小题6】
A.days
B.weeks
C.months
D.years
【小题7】
A.her
B.them
C.him
D.it
【小题8】
A.So
B.Or
C.Besides
D.However
【小题9】
A.laughed
B.talked
C.spoke
D.cried
【小题10】
A.in
B.out
C.up
D.down
【小题11】
A.give away
B.give up
C.get up
D.stand up
【小题12】
A.happily
B.sadly
C.badly
D.hopeless
【小题13】
A.cry
B.shout
C.hit
D.smile
【小题14】
A.open
B.close
C.lock
D.mend
【小题15】
A.classroom
B.office
C.door
D.shop