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内环境稳态是机体进行正常生命活动的必要条件。下图表示人体维持内环境稳态的几种调节方式。 科学研究表明，精神因素（焦虑、紧张等心理应激）会使T细胞活性下降，对病毒、真菌感染的抵抗能力和对肿瘤细胞的监控能力下降，还间接导致机体生成抗体的能力降低，其原因是T淋巴细胞可以分泌免疫活性物质——（）。
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A.
Achilles’ heel
B.
child’s play
C.
green fingers
D.
last straw
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【单选题】( ), but could you tell me how to go to the Friendship Store?
A.
Good morning
B.
Hello
C.
Excuse me
D.
Thank you
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A.
Hello
B.
Excuse me
C.
THank you
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