2. 辨析: look up, look at, look after, look for, look like
look up意为(1) , look at意为(2) , look after意为(3) , look for意为(4) , look like意为(5) 。
其中, look up中的up为副词, 代词作宾语时应置于look与up之间; 如果名词作宾语, 可置于look与up之间或look up之后。
If you don’t know these words, you can look them up in a dictionary.
如果你不认识这些单词, 你可以在词典中查找。
Please look up these new words. / Please look these new words up. 请查找这些新单词。
【即学即练】阅读短文, 用look up, look at, look after, look for, look like的适当形式填空。
Last Sunday, I went to the library with my sister. We wanted to read books. On the way, we saw a little dog and stopped to (1) it. It (2) my friend’s dog. It was lost, so we decided to (3) it and (4) its owner. In the library, I met some new words. I had to (5) the words in a dictionary. Later we went out to continue searching. Finally we found the owner. We were very happy that day.

2. (1)查找 (2)看 (3)照顾 (4)寻找 (5)看起来像
即学即练：(1)looked at (2)looked like (3)look after (4)look for (5)look up

【分析】首先需明确五个look相关动词短语的词义，再结合即学即练的语境、时态要求选择合适短语，同时注意部分短语的时态变化规则。
【解析】先辨析短语词义：look up意为查找，look at意为看，look after意为照顾，look for意为寻找，look like意为看起来像。再分析即学即练：(1)过去发生的事，看到小狗停下来“看”它，用look at的过去式looked at；(2)小狗“看起来像”朋友的狗，用look like的过去式looked like；(3)decide to后接动词原形，此处是“照顾”小狗，用look after；(4)与decide to并列，是“寻找”主人，用原形look for；(5)have to后接动词原形，此处是在字典里“查找”单词，用look up。
【答案】2. (1)查找 (2)看 (3)照顾 (4)寻找 (5)看起来像；即学即练：(1)looked at (2)looked like (3)look after (4)look for (5)look up
【知识点】动词短语辨析，一般过去时，固定搭配
【点评】本题考查常见look短语的词义及语境运用，需结合上下文判断短语，同时注意时态变化，属于基础题型，侧重词汇积累与语境分析能力。
【难度系数】0.5

1. 宾语从句
在句子中充当宾语的从句叫作宾语从句。
我们在本单元学习的主要内容是由从属连词that, if, whether引导的宾语从句。
that引导的宾语从句表示某人所说或所想，或(1)一个事实或理由，而if和whether引导的宾语从句表示选择或对某事不确定，意思为“(2)”。例：
He told me that he would go to college the next year. 他告诉我他下一年要上大学。
I don’t know if there will be a bus anymore. 我不知道是否还会有公交车。
Nobody knew whether he could pass the exam. 没人知道他是否会通过考试。

1. (1)陈述 (2)是否

【分析】本题考查宾语从句中不同引导词的用法，需明确that与if/whether引导宾语从句的功能差异：that引导的宾语从句用于陈述事实、想法等内容；if和whether引导的宾语从句用于表达不确定的情况，含义为“是否”，据此可完成填空。
【解析】根据宾语从句的语法规则：that引导的宾语从句通常用来陈述事实、观点或理由，因此(1)处填“陈述”；if和whether引导的宾语从句用于表达对某事不确定或存在选择的情况，含义为“是否”，因此(2)处填“是否”。
【答案】(1)陈述 (2)是否
【知识点】宾语从句的引导词用法
【点评】本题聚焦宾语从句核心引导词的基础用法，属于英语语法的必掌握内容，难度较低，适合巩固基础。
【难度系数】0.8