关于记忆细胞的叙述错误的是( )
A.已接受抗原刺激B.仅限于B细胞C.可自下而上数月至数年D.参加淋巴细胞再循环E.再次遇到抗原时能迅速增殖、分化
参考答案:B
糖皮质激素的分泌主要受下列哪一因素控制()
A.ACTH
B.交感神经兴奋性
C.副交感神经兴奋性
D.血糖
E.血容量
It is the test system, ________ the teachers, that is to blame for the heavy burden of middle
school students nowadays.[ ]
A. other than
B. or rather
C. rather than
D. more than