题目

警戒色是某些有毒的或不可食的生物所具有的鲜艳醒目的颜色,这种颜色往往会对捕食者形成信号作用,使其避而远之。某人进行了与警戒色有关的模拟实验:让a、b两组小鸡分别在不同颜色的地板上啄食均为苦味的谷粒,并对啄食情况进行统计,结果如下图所示。据此分析,下列结论成立的是(      ) A、实验初期,小鸡对两种颜色的谷粒啄食比例均等 B、实验初期,鲜艳醒目的谷粒颜色对小鸡是警戒色 C、随实验次数增多,小鸡对醒目颜色的谷 补全对话 填入适当的单词,使对话完整与正确。 A:Hello.5678943. B:Hello.Could I speak to Kate, please? A:Sorry.She isn't here at the(1)________ B:Is that Jim? A:Yes.Who's(2)________? B:This is Mary speaking. A:Hello, Mary.Can I(3)________ a message? B:Yes.Could you ask her to come to my house at five this afternoon? A:All right.It's 3∶30.I(4)________ she'll be back before 4 o'clock.I'll tell her about it as(5)________ as she comes back. B:Thanks a lot.Bye. A:It's a pleasure.Bye.
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