八年级研究性学习小组的同学对动物行为作了下列叙述，你认为正确的是_刷题宝

题干

八年级研究性学习小组的同学对动物行为作了下列叙述，你认为正确的是（　　）

A：动物的先天性行为是由遗传物质所决定的

B：动物的学习行为与遗传因素无关

C：白蚁营群体生活的行为属于繁殖行为

D：无贼遇敌害时喷出“墨汁”属于攻击行为

上一题下一题 0.0难度选择题更新时间:2019-03-04 09:40:39

答案(点此获取答案解析）

A

同类题1

农奴制改革的进步性集中表现在
①封建地主主持下的资产阶级性质的改革
②实现了封建生产方式向资本主义生产方式的转变
③广大农奴获得了人身自由，有利于工业革命的扩展
④农民的生产积极性提高，促进了俄国农业乃至经济的发展

同类题2

甲、乙两种固体物质（不含结晶水）的溶解度曲线如图所示．下列说法正确的是（　　）

同类题3

如图甲，固定在光滑水平面上的正三角形金属线框，匝数n=20，总电阻R=2.5Ω，边长L=0.3m，处在两个半径均为

的圆形匀强磁场区域中．线框顶点与右侧圆中心重合，线框底边中点与左侧圆中心重合．磁感应强度B₁垂直水平面向外，大小不变；B₂垂直水平面向里，大小随时间变化，B₁、B₂的值如图乙所示．（　　）

同类题4

“螳螂捕蝉，黄雀在后”，下列对螳螂、蝉和黄雀三种生物所处的食物链和食物网的叙述，正确的是（　　）

同类题5

根据对话内容及方框内所给句子补全对话，有一项是多余选项。

A: How nice to see you back, Li Lei!

B: Hi, Judy! I just came back yesterday.

A:____

B: Wonderful! I've been to many places of interest and I enjoyed myself in Disneyland.

A:____

B: Not really. Sometimes I got into trouble. They spoke too quickly and I couldn't have long conversations with the people there.____

A: Yes, I agree. I know English is very important, but I often feel sleepy in English classes.____

B: I'm afraid, too. And it's very difficult for me to remember new words.

A: Me, too. I don't know what to do____

B: Don't let these difficulties discourage(使气馁) you. Remember: where there is a will, there is a way.

A: Sure, I won't. I'll try my best.

B: So will I.

A. How was your trip?

B. At times I feel like giving up.

C. What did you buy in the USA?

D. I'm really afraid of the final exam.

E. I think I should work harder in English.

F. Could you make yourself understood in the USA?

小学学科试题库

初中学科试题库

高中学科试题库