B
Yeshe Dolkar still remembers the moment when she saw snow leopards(雪豹) at the Sanjiangyuan National Nature Reserve. On a cold snowy day, the girl was walking down a mountaintop with her family 1 they saw two snow leopards near the Lancang River.
Many wild animals living in the area are in danger. Since the middle of the 2 (twenty) century, the area of snow-covered ground, grassland and lakes in Sanjiangyuan has become smaller because of 3 (human).
4 (protect) the area and the wildlife there, China set up the Sanjiangyuan National Nature Reserve. Over the past years, the number of wild animals has become larger and larger. At 5 (little) 1,000 snow leopards can be found in the area.
Local people have improved their understanding about environmental protection and have tried hard to look after the 6 (beauty) environment in Sanjiangyuan over the years. In Nangqian, local people mostly dig caterpillar fungus(冬虫夏草) in the grassland for a living. In the past, they carried food with them in plastic(塑料的) bags and 7 (leave) the bags behind. But now people always take food waste down the mountains, according to Palden Wangchuk, 8 18-year-old young man. “The local government often invites people to pick up waste on the grassland. 9 the help of the local government and people, the grassland has put on a new look,” he said.
“As teenagers, we should 10 (act) now to protect our home and keep on living together with nature in harmony(和睦),” Palden Wangchuk added.
1.
when
2.
twentieth
3.
humans
4.
To protect
5.
least
6.
beautiful
7.
left
8.
an
9.
With
10.
act
解析：
【分析】
本题为英语语法填空题，需结合语境、固定句型、词形变化、时态、冠词、介词等语法知识逐一分析每个空格：
1. 考查固定句型“be doing sth. when...”，表示“正在做某事这时突然……”；
2. 表示“二十世纪”需用序数词；
3. 此处泛指“人类”，需用名词复数；
4. 空格处表目的，需用不定式作目的状语；
5. 固定搭配“at least”意为“至少”；
6. 修饰名词“environment”需用形容词；
7. 由并列谓语动词“carried”可知，此处用一般过去时；
8. “18-year-old”以元音音素开头，表泛指需用不定冠词；
9. 固定搭配“with the help of”意为“在……的帮助下”；
10. 情态动词“should”后需接动词原形。
【解析】
1. 固定句型“be doing sth. when...”为常用结构，故填when；
2. 表示“二十世纪”，基数词twenty需转换为序数词twentieth，故填twentieth；
3. 此处泛指人类群体，名词human的复数形式为humans，故填humans；
4. 空格处表“为了保护……”，用不定式作目的状语，故填To protect；
5. 固定搭配“at least”是固定表达，意为“至少”，故填least；
6. 名词environment需用形容词修饰，beauty的形容词形式为beautiful，故填beautiful；
7. 由并列谓语carried（过去式）可知，此处需用leave的过去式left，故填left；
8. 18-year-old以元音音素/eɪ/开头，表泛指“一个”用不定冠词an，故填an；
9. 固定搭配“with the help of”意为“在……的帮助下”，句首首字母大写，故填With；
10. 情态动词should后接动词原形，故填act。
【答案】
1. when
2. twentieth
3. humans
4. To protect
5. least
6. beautiful
7. left
8. an
9. With
10. act
【知识点】
固定搭配、词形转换、语法运用
【点评】
本题为基础英语语法填空题，考查学生对核心语法知识（固定句型、时态、词性转换、冠词介词用法）的掌握，难度适中，需结合语境和语法规则逐一推导答案。
【难度系数】
0.6
