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若空气中的相对湿度太低,很容易产生
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举一反三
【单选题】----Peter has good grades in all his subjects, but he never shows off. ----I agree. He is very ________.
A.
easy-going
B.
imaginative
C.
modest
D.
generous
【简答题】学者( )被称为现代管理理论的 “鼻祖”。
【单选题】Tom is very modest. He never ___________ before his friends.
A.
shows off
B.
shows up
C.
turns off
D.
turns on
【单选题】Daniel is very modest. He never __________ before his friends.
A.
shows off
B.
shows up
C.
turns off
D.
turns on
【单选题】Jim off the lights and then left the classroom.
A.
was turn
B.
had turned
C.
has turned
D.
was turned
【多选题】TH cells are the primary regulators of T-cell– and B-cell– mediated responses . They________
A.
express the CD4 coreceptor molecule
B.
recognize foreign antigen complexed with MHC class II molecules on B cells, macrophages, or other APCs
C.
aid effector T lymphocytes in cell mediated immunity
D.
aid antigen-stimulated subsets of B lymphocytes to proliferate and differentiate toward antibody-producing cells
【单选题】Which cell has the shortest life( )
A.
spermatogonia
B.
primary spermatocyte
C.
secondary spermatocyte
D.
spermatid
E.
sperm
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