You can sit on either of the end of the boat .
Both answers are correct . 两个答案都对。
Either answer is correct . 两个 ( 中的任何一个 ) 答案都对。
Neither answer is correct . 两个答案都不对。
2 . at first 起初，开始时
At first the baby was happy . Half an hour later she began to cry .
at last 最后，终于／at the beginning of 起初
At last he had an idea . 终于，他有了主意。
I found a job at the beginning of last month . 上月初我找到一份工作。
3 . climb up 攀登，爬上
There he gets out of the lift and climbs up to the fifteenth floor on foot .
4 . at the foot of 在……的底部 ( 脚下 )
There is a small river at the foot of the hill .
5 . go down 下去， ( 日，月等 ) 落下
The sun has gone down .
The wind has gone down a little .
6 . have a great time = enjoy oneself过得愉快极了
I had a great time during the holidays .
—Did you have a great time at her birthday party ?
—Yes , we had a great ( good , nice , wonderful ) time .
7 . at all 全然；究竟
①用于否定句，意为“一点儿也不”，“完全不”。
I didn\t understand anything at all .
No problem at all . 完全不成问题。
②用于疑问句，意为“究竟”，“到底”，“真的”。
Do you know it at all ?
8 . be interested in 对…感兴趣
At the age of eight he became very interested in maths .
9 . have a big smile 满面笑容
You can see from my photograph that I have a big smile and long black hair .
He had a big smile when I met him next .
10 . ask for 要求，约请
Mary asked for time to think this over .
11 . be covered with 覆盖着
The table is covered with a cloth .
The mountains were covered with snow .
二、学海导航
【学法指要】
单元难点疑点思路明晰
1 . 由 though 引导的状语从句的句型
Though I like writing to my penfriend , it takes a lot of time . 虽然我喜欢给笔友写信，但花了很多时间。
※ 由连词 though ( 虽然 ) 引导的状语从句，全句中有“但是”之意，然而 thought 与 but 不能前后连用，只能用其中一个。上句也可以说成：
I like writing to my penfriend , but it takes a lot of time .
※ though 引出的从句放在句首时，从句后面要有逗号。但也可将 though 引出的状语从句放在主句之后。
Though it was raining , he went there .
He didn\t do this work well though he did his best . 虽然他尽了最大努力，但还是没干好这工作。
※ though 常与 even 连用，表示强调。如：
Even though I didn\t understand a word , I kept smiling .
2 . 由 after 引导的时间状语从句的句型
But after we left the mountains behind us , there was hardly a cloud in the sky . 然而当我们把群山峻岭甩在后面后，天空几乎万里万云。
※ after we left the mountains behind us，是由连词 after 引导的时间状语从句。引导时间状语从句的还可由 when , while , before , till , since 等词引起。
leave behind 是“把 ( 某物 ) 留在 ( 某物 ) 的后面”。
由 after 引导的时间状语从句举例如下：
After we had finished lunch , we all sat on the grass .
※ after 引导的从句，有时放在主句之后。如：
I arrived at the station after the train had left .
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