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【单选题】
有的抗原称为TI-Ag,是因为这些抗原A.
来源于非胸腺组织，也不需要胸腺的辅助
B.
无需T细胞，直接刺激B细胞产生抗体
C.
诱生的抗体是在骨髓中产生的
D.
诱生的抗体属于IgG类抗体
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【单选题】Susan Torres had been put on life support so
A.
she could live comfortably.
B.
she could see her baby.
C.
she could die without pain.
D.
she could deliver her baby.
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A.
how little money
B.
such little money
C.
so little money
D.
what little money
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【单选题】What does the immigration agent say to Emi?
A.
"Excuse me" and "You're welcome."
B.
"Thank you" and "What do I do now?"
C.
"Thanks" and "Next!"
【单选题】I wondered if she could have the opportunity to spend______here so that she could learn more about the city.
A.
sometimes
B.
some time
C.
sometime
D.
some times
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