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第二天早上，我正感到绝望的时候，一艘船发现了我。
句中的when表示“这时，就在这个(那个)时候(=and then；and just
then；and at that time)”，当when作此意讲时，通常和正在发生的或即将发生的动作连用，构成：be doing ...when .../be about to do ...when
...的句型。其中when引导的从句要用一般过去时。
Page No.414
I was wandering
through the streets when I caught sight of a tailor’s shop.
我正在街上闲逛，(这时)忽然看见了一家服装店。
We were having a
meeting when someone broke in.
我们在开会的时候，有人突然闯入。
We were about to
set off on our way when it suddenly began to rain. 我们快要动身离开的时候，天突然下起了雨。
高手过招
单项填空
Jasmine was
holidaying with her family in a wildlife park
she was bitten on the leg by a
lion.
(2009·12·河南开封检测)
When B. while
C. since D. before
解析:选A。when在本句中为连词，相当于and just then, and
just at that time, 意为“就在那时”。引导一个忽然出现的动作。
句意为：Jasmine 正在和她的家人在野生动物园度假时，她被
狮子咬伤了腿。
Page No.415
Unit 4
Astronomy：the science of the stars
Page No.416
1. spread
vt.&vi. 展开,铺开;散布;扩大;延伸
The bird spread
its wings. 那只鸟展开了翅膀。
Flies spread
disease. 苍蝇传播疾病。
常用结构:
spread sth. with
sth. 用……抹/涂/铺……
spread ...on ...把……抹/涂/铺在……
be spread for摆好（桌子）准备
spread oneself\[口\]舒展四肢(躺下)
spread out张开，伸开，铺开，展开，伸长
"Times New Roman"'>④to
persuade
⑤find it hard to imagine⑥found the lights on
14. The next
morning I’d just about given myself up for lost when I was spotted by a ship.
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