三、词汇运用
A. 用方框中所给词语的适当形式填空，每词仅用一次。
unknown board model planet unlock the secrets of
Last week our science class started a new topic about space. Our teacher said we'd try our best 21 ______ the solar system. First, she showed us small 22 ______. They were made to look like real space objects. Then she talked about different 23 ______ and their special features. She said Jupiter is the biggest one among them. She also told us there are still many 24 ______ things about space waiting for us to discover. After class, she put a notice on the school 25 ______. It asked students who are interested to join the space study club. I wrote my name down right away because I really love learning about stars and planets.

21. to unlock the secrets of 22. models 23. planets
24. unknown 25. board

【分析】
这是一道词汇运用题，需先明确方框内词汇/短语的含义：unknown（未知的）、board（板，此处指公告板）、model（模型）、planet（行星）、unlock the secrets of（揭开……的秘密）。解题思路为：先结合每空的语境判断所需词性/词义，再考虑固定搭配、名词单复数等语法规则，同时注意每词仅用一次的要求。
【解析】
21. 固定搭配“try one's best to do sth”意为“尽某人最大努力做某事”，结合语境“我们要尽力揭开太阳系的秘密”，此处需用动词不定式，故填to unlock the secrets of。
22. 空前有形容词small，空后提到“它们被制作成看起来像真正的太空物体”，可知此处指“模型”，model是可数名词，对应后文的“they”需用复数形式，故填models。
23. different后接可数名词复数，结合后文提到的木星（行星），可知此处指“行星”，planet的复数形式为planets，故填planets。
24. many后需接形容词修饰名词things，结合语境“还有很多未知的事物等待发现”，故填形容词unknown。
25. “school board”是固定短语，意为“学校公告板”，结合语境“老师在学校公告板上贴了通知”，故填board。
【答案】
21. to unlock the secrets of 22. models 23. planets 24. unknown 25. board
【知识点】
词汇运用、固定搭配、名词单复数
【点评】
本题考查词汇在语境中的灵活运用，涉及固定搭配、名词单复数、形容词用法等基础知识点，难度适中，学生需结合语境和语法规则准确选择词汇并变形。
【难度系数】
0.7

B. 阅读下面的短文,根据括号里所给汉语意思写出单词的正确形式(每空限填一词)。
Early this month, our school's science club set off on a field trip to a small town in the 26 (北部的) part of the province. We wanted to learn about how clean the local river is, and before we left, our teacher shared her 27 (观点) that close teamwork would help us get better information.
As soon as we arrived, we went to the nearby river to get some water. Back at the small lab we set up for the trip, we tested each part of the water carefully and recorded our 28 (结果) in detail. We also noticed the riverbank's special 29 (风格) of stone paths—local villagers told us these paths had been there for over 50 years. To keep our water-testing tools clean, we used 30 (很热的) water to kill small harmful things, which helped avoid mixing unwanted 31 (化学品) into new water we took.
Later, we talked with the villagers about protecting the river. They 32 (提到) this river runs through three nearby states and is an important source of water for both people and farmland. The next morning, we worked with the villagers to 33 (清除;清理) trash along the riverbank, filling up several big bags. After the trip ended, we 34 (上传) our full research report to the school website. We were not sure 35 (是否) other students would notice our report. To our surprise, lots of them left messages saying they wanted to join our next environmental trip.

26. northern 27. belief 28. findings
29. style 30. boiling 31. chemicals 32. mentioned 33. clear
34. uploaded 35. whether

【分析】
首先通读短文，理解文章讲述学校科学俱乐部实地考察的经历。解题时需结合括号内的汉语提示，依据句子结构（如修饰名词用形容词、形容词性物主代词后接名词等）、词性要求、时态规则及固定搭配，确定每个空的单词正确形式。例如：26题修饰名词part需用形容词，对应“北部的”；27题形容词性物主代词her后接名词，对应“观点”；其余题目同理，结合语境和语法规则匹配单词。
【解析】
26. 空格修饰名词part，需用形容词，“北部的”对应单词northern；
27. 形容词性物主代词her后接名词，“观点”对应单词belief；
28. 此处指测试的结果，用名词复数形式，对应“结果”的单词findings；
29. 空格处表示“风格”，修饰stone paths，对应单词style；
30. “很热的水”常用boiling water（沸水），用形容词boiling；
31. “化学品”是可数名词，此处表泛指用复数形式chemicals；
32. 文章整体为过去时态，“提到”的过去式为mentioned；
33. “清除；清理垃圾”是固定搭配clear trash，用动词原形clear；
34. 文章为过去时态，“上传”的过去式为uploaded；
35. 空格处引导宾语从句，表“是否”，用whether。
【答案】
26. northern 27. belief 28. findings 29. style 30. boiling 31. chemicals 32. mentioned 33. clear 34. uploaded 35. whether
【知识点】
形容词用法、名词单复数、动词时态
【点评】
本题为根据汉语提示填单词的基础题型，考查学生对核心词汇的词义、词性及形式变化的掌握，需结合句子结构和语境判断单词的正确形式，整体难度不大，是初中英语常见的基础题型。
【难度系数】
0.7