【C6】
A．change
B．notes
C．checks
D．bills
请帮忙给出正确答案和分析，谢谢！
A．examB．problemsC．checksD．tests
A．changeB．observeC．improveD．meet
【C4】A．changeB．alterC．varyD．differ
【C10】A．changeB．alterC．varyD．contrast
【C6】A．changeB．mistakeC．differenceD．mark
【C2】A．changeB．decisionC．reductionD．relation
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