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【多选题】
与 T 淋巴细胞识别活化有 CD 分子是 :A.
CD2
B.
CD3
C.
CD4
D.
CD8
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参考解析：
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皮皮学刷刷变学霸
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【简答题】形成稳定乳状液必须具备的条件是什么?
【单选题】Monica _________ her emails now, and then she is going to write back.
A.
checks
B.
is checking
C.
is going to check
D.
will check
【单选题】Of all the subjects，I like________history most as it gives me________useful knowledge of what happened even centuries ago. [ ]
A.
the；a
B.
/；/
C.
a；the
D.
a；/
【单选题】I still don't know what ___ when I was away from home.
A.
happens
B.
was happened
C.
happened
D.
has happened
【单选题】幻想群体 是指?
A.
有明确的交易目的，参与具体交易活动的网络消费者群体，他们一般通过与其他成员的相互交流，在尽可能获得更多商品信息的基础上作出购买决策。
B.
由于在现实生活中有类似经历，并在网络交流中相互倾诉而构成的群体。
C.
追求在虚拟的网络世界创造与现实世界完全不同的环境或人格个性的网上群体。
D.
对某种具体活动（如：购物、社交等）有共同兴趣的网上群体，他们一般更注重相互之间的信息交流。
【单选题】I was spending my holidays at the time, so I have no idea how it________A．was happeningB．happene
A.
24. I was spending my holidays at the time, so I have no idea how it________ A．was happening
B.
happened
C.
happens
D.
has happened
【单选题】It _______ to me that we still have many things to do, so I went back to my office at once.
A.
happened
B.
struck
C.
occurred
D.
broke out
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