乘坐国内航线旅游时，已满2周岁未满12周岁的儿童按成人票_____付费。
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Which of the following italicized parts is an inflectional morpheme？(2013)
A. Unlock
B. Government
C. Goes
D. Off-stage
美国药典的英文缩写为()
A. USP
B. GMP
C. BP
D. JP
E. WHO
挖掘机在升降旧段时，必须检查好旧段的规格。在升降过程中要找好方向打好掩。()
Which of the following statements about language is NOT true？
A. Language is a system.
B. Language is symbolic.
C. Animals also have languages.
D. Language is arbitrary.
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