[单选题]In teaching speaking, the two basic ways to teach vocabulary are through ( ) and ( ).Pte答案窝(daanwo.com)-大学生作业答案及考资分享平台 Aincidental learningPte答案窝(daanwo.com)-大学生作业答案及考资分享平台 Bpurposeful learningPte答案窝(daanwo.com)-大学生作业答案及考资分享平台 Cdirect vocabulary instructionPte答案窝(daanwo.com)-大学生作业答案及考资分享平台 Drote learning