The author believes that it is important that spoken language______.
A. be learned at an early age
B. not be confused with body language
C. not be confused with written language
D. be learned in the context of a caring relationship
《国际民用航空条约》规定各缔约国可在其领空行使哪些主权？
The basic content of Lamarcks theory lies in______.
A. descendants" inheritance of certain traits
B. overthrowing the evolutionary theory of Darwin
C. environment"s biological consequences
D. the change of gene sequences
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