What is the author trying to tell us?
A.Happiness often goes hand in hand with pain.
B.One must know how to attain happiness.
C.It is important to make commitments.
D.It is pain that leads to happiness.
第2题
A.都采用了雕刻凹版印刷
B.都应用于票面正面的图案
C.在紫外光下具有明亮的荧光特征
D.透光观察都可见正背面图案组成完整的图案
第7题
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