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【单选题】
有一原电池Pt|Fe 3+ (1mol·dm -3 )，Fe 2+ (1mol·dm -3 ||Ce 4+ (1mol·dm -3 )，Ce 3+ (1mol·dm -3 )|Pt，则该电池的电池反应是( )。A.
Ce 3+ +Fe 3+ =Ce 4+ +Fe 2+
B.
Ce 4+ +Fe 2+ =Ce 3+ +Fe 3+
C.
Ce 3+ +Fe 2+ =Ce 4+ +Fe 3+ D Ce 4+ +Fe 3+ =Ce 3+ +Fe 2+
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【单选题】听力原文：M: Professor Linda，we were wondering if we could sit in on your English class. W: I wish I could say yes，but if I accepted you two，I wouldn't know how to say no to a lot of others who have made t...
A.
She rejects their request.
B.
She accepts their request.
C.
She agrees to consider their request.
D.
She asks them to come with the others.