题目内容
（请给出正确答案）
[主观题]
In the long run, English learning, difficult as it is, is ______ to a learner iii his or h
er career devel- opment.
A．profitable
B．advantageous
C．prominent
D．rewarding
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A．混合性酸碱平衡紊乱
B．代谢性酸中毒
C．呼吸性酸中毒
D．代谢性碱中毒
E．呼吸性碱中毒
