桡神经浅支损伤有桡神经深支损伤有 A.腕下垂 B.掌指关节不能主动伸直，拇指不能外展

下图为生态系统各个成分间的相互关系。下列有关说法错误的是

A是生产者，它能够将无机物转变为有机物

B．B为消费者，它和C的关系为消费关系

C．C是分解者，它对生态系统的物质循环起着重要的作用

D．若ABC包括地球上所有的生物，则该生态系统为生物圈

写作。根据中文提示，写出内容完整、意思连贯、符合逻辑、不少于50词的短文。

       下面是一位美国中学生的来信。假设你是王英，请你写一封回信，解答他来信中提出的问题。（信的开头及结尾均已给出，不计入总词数。）

Dear Wang Ying,

        How are you? Summer holiday is coming soon. I'm going to the seaside for my holiday. But I don't like

to go there with my parents. I don't get on well with them because they are always trying to teach me. Do you

have the same problem? What about parents? How can we get on well with our parents?

        Hope to hear from you soon. 

                                                                                                                                           Yours, 

                                                                                                                                      David Smith  

Dear David,

        Thank you for your letter. I'm very well, thank you.

        For my summer holiday,                                                                                                                  

        Hope to hear from you again.

                                                                                                                                           Yours,

                                                                                                                                        Wang Ying      

角α是等边三角形的一个内角，则2sinα+tanα=______．

在我国，班氏丝病的主要传播媒介是（）

A.致倦库蚊和淡色库蚊

B.曼蚊

C.窄卵按蚊

D.马蝇或红蝇

E.中华按蚊

网络控制中心的主要功能是什么？（）

A.IP认证

B.节点名称认证

C.配置GK

D.GK日常管理