一、20个英文单词
1，leaf
n.叶，（书的）页，张
The leaf is left under the ocean.
2，stomach
n.胃，胃口，腹部；vt.忍受，吃得下
We should eat healthy food if we want a strong stomach.
3，mess
n.凌乱，脏乱，肮脏，困境，混乱，食堂，大量某物；v.弄脏，弄乱，随地便溺
The living room is in a mess after a party.
4，prefer
vt.更喜欢，提出，宁愿，提出（控告）
The girl prefers vegetables to cake.
5，dragon
n.龙(西方的)，凶恶的女人，凶暴的人，严厉的人
Look! This dragon can breathe fire!
6，slim
adj.苗条的，细长的，单薄的，微小的；v.(用运动，节食等方式)减轻体重，变苗条，减轻体重，变苗条
Ever since she started eating a healthy diet,she has had a very slim figure.
7，almost
adv.几乎，差不多
The starting process of this computer is almost finished.
8，concert
n.音乐会，一致，和谐，合作；v.协调，协力
The animals are holding a concert in the forest!
9，basket
n.篮，篓，筐；v.把...装入篮内，把...丢入字纸篓里
I always use this basket to pack food for a picnic.
10，invent
vt.发明，编造；v.创造
He invented a pair of special shoes which allowed people to walk on water.
11，cost
n.价格，成本，花费，代价，损失；v.花费，估算...的费用，使付出代价，成本为，价钱为，需花费
The cost of this new house is one million dollars.
12，ticket
n.票，入场券，证明；vt.售票，给...门票，加标签于，指派，对...开交通违章通知单
They got two tickets to fly back.
13，happen
vi.发生，碰巧，偶遇，恰好，出现
How did this horrible accident happen?
14，away
adv.离开，远离，...掉，在安全的地方；adj.不在的，遥远的，客场的
The blue balloon flies away.
15，festival
n.节日，活动
Traditionally people spend time with their families during the Chinese Spring Festival!.
16，emergency
n.紧急情况，突发事件，急诊；adj.紧急情况下的，应急的
It's an emergency;get her to the hospital as soon as possible.
17，litter
n.垃圾，杂乱，一窝幼崽，铺垫物；v.乱丢，（使）遍布
We should clean up litter to keep the outdoors clean.
18，polite
adj.有礼貌的，文雅的，上流的
This polite girl gave her seat to an old lady.
19，lamp
n.灯，台灯
The lamp gives out a dim light at night.
20，artist
n.艺术家，画家，大师
The artist is spraying colors on the wall.
二、排列组合命题模型精讲
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