【单选题】下列有关种群和群落的叙述正确的是______。
D.
群落中两个物种之间可能存在一种以上的种间关系
【单选题】Jack failed the exam again. He ________ he __________ the teacher's adivce
【判断题】任何一种消费活动,都是既包含了消费者的心理活动又包含了消费者的消费行为。
【判断题】()“收入-费用利润”这一会计等式,体现了企业-定时期内的经营成果,是编制利润表的基础。
【判断题】群落中的两种生物之间可能具有两种种间关系。
【判断题】由于时间有限,教师在上课时没有必要花时间说明为什么要学习这一内容。
【单选题】下列关于种群和群落的叙述中,正确的是
B.
一个生物群落中两种生物之间可能具有两种种间关系
【单选题】听力原文:W:Jack failed in the exam again. M:He had played basketball all the time and did not study. Q:Why didn't Jack pass the exam again? (10)
A.
Jack failed in the exam for the first time.
B.
Jack was a very good basketball player.
C.
Jack paid no attention to his study before the exam.
D.
Jack played basketball after the exam.