题干

如图所示为欧洲兔引入澳大利亚后,对袋鼠数量影响以及当地人采取相应防治措施后种群数量的变化曲线.下列说法错误的是(  )

A:欧洲兔与袋鼠之间种间关系为竞争关系

B:引入的狐狸与袋鼠之间没有捕食关系

C:引入黏液瘤病毒是防治兔灾的有效方法

D:d年开始欧洲兔对黏液瘤病毒抗性增强

上一题 下一题 0.0难度 选择题 更新时间:2019-12-23 04:18:17

答案(点此获取答案解析)

B

同类题3

阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

           We're human, and it's not always easy to get along with everyone all the time.Sometimes we hurt other people's feelings without intending to. Sometimes,we're ____(deliberate) mean and we feel bad afterward. So we apologize. Apologies are one of the tools we use to build good friendships andrelationships. ____ you say“I'm sorry” (and really mean it), it's because youprobably feel bad that something you did or said hurt the other person. Sayingyou're sorry is more than just words. You're also saying that you respect theother person  ____  you care about his or her feelings.Apologizing shows you have empathy.

     After  apologizing,you might feel alittle ____(good).The other personprobably will, too. When you apologize in a caring way, you can feel goodbecause you are trying to make things right again.

     Some times a heartfelt“I'm sorry” ____(fix) everything right away. Other times,it might take  ____while for someone to get past feeling upset. You may need to give the otherperson some time. Even after you say you're sorry, you might still feel bad aboutwhat you said or did—but you can feel good about apologizing, fixing themistake, or making up your ____ to do better. When someone apologizes to you,you may welcome it and be ready to forgive  ____ happened and move on. Or you might not feel like being friendly againright away. If a person keeps hurting you and ____ (apologize)without making aneffort to change,you might not want tohang about ____  that person any more.