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【单选题】
免疫是指A.
机体排除病原微生物的功能
B.
机体清除损伤和衰老细胞的功能
C.
机体抗感染的防御功能
D.
机体识别和排除抗原性异物的功能
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【单选题】This is one of the means ______ the electricity energy is conducted from one place to another. [ ]
A.
by which
B.
by that
C.
what
D.
which
【简答题】花岗岩属于
【单选题】This is one of the few best films _____ highly thought of by the public. [ ]
A.
which is
B.
that are
C.
that is
D.
which are
【单选题】( 2019 广西北部湾 ) 下列有关生物生殖发育的叙述 , 正确的是
A.
. 用马铃薯的块茎繁殖新植株属于有性生殖
B.
. 在适宜的条件下 , 鸟卵均能孵化成雏鸟
C.
. 青蛙的生殖发育过程离不开水 , 幼体和成体均用鳃呼吸
D.
蝗虫的发育过程经历了受精卵、若虫和成虫三个阶段
【单选题】This is one of the best films that ___ this year. [ ]
A.
is appearing
B.
appear
C.
has appeared
D.
have appeared
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