问题
选择题
下列环境属于天然环境的是（ ）
A．城市环境
B．农田
C．高山草甸
D．黄河大堤
答案
答案：C
天然环境的特征是自然性，表现为人类活动没有有意识地去改造或影响它。高山草甸是以多年生草本植物为主的植物群落，分布在高山或高原比较湿润的地方，人类活动很少改变它。
搜题请搜索小程序“爱下问搜题”
下列环境属于天然环境的是（ ）
A．城市环境
B．农田
C．高山草甸
D．黄河大堤
答案：C
天然环境的特征是自然性，表现为人类活动没有有意识地去改造或影响它。高山草甸是以多年生草本植物为主的植物群落，分布在高山或高原比较湿润的地方，人类活动很少改变它。
| 完形填空。阅读下面短文，从短文后所给的四个选项中，选出可以填入空白处的最佳选项。 | ||||||||||||||
| Two friends were walking 1 the desert. During the journey they 2 . And the taller boy slapped the shorter 3 in the face. The shorter boy was hurt. But 4 , he wrote in the sand, "Today my best friend slapped me 5 the face." They 6 till they found a pond. And they decided to take a bath there. The shorter boy 7 in the mud and started to sink. He 8 , "Help! Help!" Luckily, he was pulled to 9 by his friend. After that, he carved on a stone, "Today my best friend 10 ." The taller boy asked him, "After I hurt you, you 11 in the sand, but now you carve on the stone. Why?" The shorter boy replied, "When someone 12 you, you should write it in the sand 13 the wind can erase (清除) it easily. However, when someone 14 for you, you should carve it on a stone from which the wind can 15 erase it." | ||||||||||||||
|