The teacher came in _______ a book under his arm. [ ]
A. by
B. with
C. for
D. carry
答案:B
小丽走一步长约5分米,她从家到学校一共走了540步,算一算,她家到学校大约有多少米?
伤寒和细菌性疟疾会引起人体发热原因是什么?()
A、白介素1含量升高
B、血红素含量升高
C、甲状腺素含量升高
D、肾上腺素含量升高