位于脊髓后索内侧传导下部躯干及下肢深感觉的是（） A.脊髓丘脑束 B.皮质脊髓束 C

下图中，根尖吸收水分和无机盐的主要部位是

A．①

B．②

C．③

D．④

写作题。

阅读下面的短文,然后按照要求写一篇150词左右的英语短文.

     The purpose of a high school graduation ceremony is to celebrate students who have

successfully met the academic and extracurricular requirements for graduation. The ceremony

provides a public chance in which graduating students receive their diplomas(文凭), marking

their official graduation from high school. High school graduation ceremonies are typically held

at the end of the academic year and are attended by teaching staff, graduates and their families

and friends.

     Though the event lasts only a few hours, a great ceremony is a memory that those who attend

can treasure for years and years. Rather than marking the end of one stage in a student's life,

graduation signifies the beginning of the next.

Along with the awarding of the diplomas, the commencement address(毕业演说) is an essential

part of the ceremony. The address traditionally congratulates graduates on their achievements,

encourages them on their endeavors and imparts wisdom for the future.

【写作内容】

假如你作为毕业生代表,要在高中毕业典礼进行演讲.请根据以下内容写一份演讲稿.

1. 以约30个词概括这篇短文的主要内容；

2. 然后以约120个词围绕高中生活和毕业的话题进行讲述,内容包括:

(1)高中毕业给你的感受；

(2)举一件难忘的高中经历说明你在高中三年学习生活的收获；

(3)在毕业之际,你想感激哪个人,简单说明理由.

【写作要求】

1)在作文中可以使用自己亲身的经历或虚构的故事,也可以参照阅读材料的内容但不得  

   直接引用原文中的句子；

2)作文中不能出现真实姓名和学校名称.

__________________________________________________________________________

在数据库的概念设计中，最常用的数据模型是______。

A．形象模型

B．物理模型

C．逻辑模型

D．实体-联系模型

农村土地

通常取紧固件边距为（）。

A、紧固件直径的2倍

B、不小于被连接板件总厚的2倍

C、紧固件直径的3倍

D、不小于被连接板件总厚的3倍