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【多选题】
Tc 细胞的主要介导 [填空(1)] 作用，T DTH 细胞主要介导 [填空(2)] ，记忆性T细胞主要介导 [填空(3)] 。A.
细胞毒
B.
迟发型反应
C.
再次免疫应答
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【简答题】阅读理解。 Canadians and Americans usually tip in places like restaurants, airports, hotels and hair salons because many people who work in these places get low salaries. A tip shows that the customer is p...
【简答题】I didn’t do many _(1)_ chores as my mother wanted me to concentrate on _(2)_ in school. But now when I get back home _(3)_ college, I try to do as much as possible, _(4)_ the floor, cleaning the windo...
【简答题】____和电子垃圾已经成为人类当下最大的敌人。
【单选题】When the delegates come, ______ help them sign the Registration Cards and collect their room keys.
A.
receptionists
B.
room attendants
C.
sales managers
D.
security guards
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