已知菱形的两对角线长分别为6㎝和8㎝，则菱形的面积为▲

搜题请搜索小程序“爱下问搜题”

问题填空题

已知菱形的两对角线长分别为6㎝和8㎝，则菱形的面积为 ▲

答案

专题：计算题．

分析：根据菱形的面积等于两对角线乘积的一半求得其面积即可．

解答：解：由已知得，菱形的面积为6×8÷2=24cm2．

故答案为24．

点评：此题主要考查菱形的面积等于两条对角线的积的一半．

填空题

阅读短文，根据首字母提示，完成单词。

English is difficult to learn because it is so different from our mother tongue (母语). Also, we don't have

much chance to speak English with foreigners or hear English (1)s_______.

So the first important thing for us to do, I think, is to (2)p_______ speaking English more both in and

out of class. In class I listen to the teacher carefully and (3)t_______ my best to answer the teacher's questions

in English. After class, I listen to the tapes and wonderful English songs. I often retell the texts in my own

words. I always work hard at English and (4)n_______ give up.

Of course this is not enough. When I find something interesting, I wrote it down in English. At first, I

couldn't write well, but with the help of my teacher, I have made great (5)p_______.

选择题

下列有关环境问题的描述中，不正确的是（　　）

A．长期食用富含镉的污水灌溉的水稻会导致水俣病

B．实施退耕还林还草，可以解决西部水土流失、土壤沙化和沙尘暴等环境问题

C．生物入侵有可能对原来的生态环境造成严重危害

D．世界环境日是每年的6月5日