昆虫的保护色越来越逼真，它们的天敌的视觉也越来越发达，结果双_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

昆虫的保护色越来越逼真，它们的天敌的视觉也越来越发达，结果双方都没有取得明显的优势.说明（）

A.自然选择不起作用

B.生物为生存而进化

C.双方在斗争中不分胜负

D.双方相互选择共同进化

答案

参考答案：D

补全对话，情景问答

从方框内选出相对应的答语。

( )1. Is this your bag?
(     )2. What's her name?
(     )3. How do you spell "book"?
(     )4. I'm Gina.
(     )5. This is your pencil.
(     )6.What's his name?
(     )7. What's your phone number?
(     )8. Hello! I'm Mary.
(     )9.What's your family name?
(     )10. What's this in English?

A. It's Smith.
B. Hi! I'm Jim.
C. It's a pencil sharpener.
D. His name is Ben.
E. It's 897-235.
F. OK. Thank you.
G. I'm Jenny.
H. B-O-O-K.
I. Yes, it's my bag.
J. Her name is Sonia.

问答题简答题

二孩有没有护理假和护理假津贴？大概多少？如何计算？