一、20个英文单词
1，dialog
n.对话；v.对话，用对话表达
The two sides entered into a peace dialog.
2，publish
v.出版，公布，刊登，发表
She hopes that her book will be published so everyone can buy it.
3，except
prep.除...之外；v.把...除外；conj.除...以外
Everyone is unhappy except him.
4，aim
v.瞄准，力求达到，力争做到，目的是，旨在；n.目标，目的，对准，枪法
The man aims at the center of the target.
5，glue
n.胶水；v.用胶粘
He's applying glue.
6，necessary
adj.必需的，必要的，必然的，势必的；n.必需品
A boat is a necessary condition to get across the river.
7，marry
v.结婚，娶，嫁，结合在一起
They finally got married.The story has a happy ending.
8，however
adv.然而，不过，无论如何，不管多么
He got a great test score,however,he's still upset.
9，remain
v.剩余，逗留，仍需去做；link-v.保持，依然，继续；n.剩余物，遗迹，残骸
Only one puppy remained in the cage as the others were sold.
10，hike
v.徒步旅行，使高涨，提高；n.远足，徒步旅行，增加，上升
A group of old people are going hiking on a sunny day.
11，unless
conj.除非，如果不，除...外
I won't buy you that toy unless you get a full mark.
12，compare
vt.比较，比作；n.比较，对照
It's smart to compare products when you go shopping.
13，packet
n.小袋；vt.包装，打包，用邮船运送
The boy received many red packets for the New Year.
14，alarm
v.使惊恐，使忧虑；n.警报器，警报，闹钟，惊恐，忧虑
The upcoming deadline alarms him.
15，silly
adj.傻的，愚蠢的，淳朴的，晕的；n.淘气鬼，傻孩子，傻瓜
He looks so silly with his head in his clothes.
16，smoke
n.烟，烟尘，抽烟；v.抽(烟)，冒烟，以烟熏
Black smoke is rising from the burning houses.
17，fog
n.雾，烟雾，尘雾；v.以雾笼罩，使模糊，迷惑
The heavy fog covers the whole city.
18，drama
n.戏剧，戏剧性的场面，激情
They're rehearsing a drama.
19，survive
vt.幸存，存活，艰难度过，比...活得长；vi.生存，活着
The girl survived the shipwreck.
20，cucumber
n.黄瓜
Cucumbers are healthy and delicious.
二、数列重难点
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