一、20个英文单词
1，presume
v.推测，假定，擅自行事，利用，以...为先决条件
People presume that she is pregnant.
2，digest
v.消化；vt.领会，理解；n.文摘，摘要
Many parts of your body are involved in digesting food.
3，optical
adj.视觉的，光学的
This optical illusion causes us to see two faces in the photo.
4，distance
n.距离，间距，远处；v.使与...保持距离；adj.远距离的
The distance between the two buildings is 2 meters.
5，clinic
n.诊所，门诊部，门诊
She took her dog to the animal clinic to see if he's sick.
6，verdict
n.(陪审团)裁决，定论，意见
The judge is making his final verdict.
7，meantime
n.同时，其间；adv.同时，当时
The movie starts in 10 minutes,in the meantime,let's get some popcorn.
8，stoop
v.弯腰，俯身，屈从，堕落，沦为；n.弯腰，屈服
Stooping down,he picked up the firewood.
9，hollow
adj.中间空的，空心的，空洞的；v.掏空；n.洞；adv.完全地，彻底地
Scallion is a sort of hollow plant.
10，species
n.种类，物种，人类；adj.物种上的
There are many different species of fish in the sea.
11，gain
v.获得，增加，赢得，取得，赚到；n.增加，好处，收获
We can gain valuable knowledge by reading books.
12，moderate
adj.中等的，适中的，适度的，温和的，稳健的；n.温和主义者，稳健的人；v.使减轻，使缓和，缓和，使适中
The yellow area indicates moderate power output.
13，arithmetic
n.算术，计算
The boy is doing arithmetic homework. It's easy for him.
14，nominal
adj.名义上的，象征性的，很少的，名词性的
He is merely a nominal head of the company.
15，Easter
n.复活节
On Easter,Christians like to decorate eggs.
16，row
n.排，行，争吵；v.划(船等)，划船；vi.争吵
There weres so many seats,the new student did not know which row to sit in.
17，suffice
v.足够
The girl believes that four eggs should suffice to make the cake.
18，harsh
adj.刺耳的，严厉的，恶劣的，艰苦的，粗糙的，强烈刺眼的，严酷的
Stop scratching the blackboard! The harsh noise is driving them crazy.
19，waist
n.腰
The man put the measuring tape around his waist.
20，dose
n.(药的)剂量，用量，一剂；vt.给...服药
The doctor is telling the patient the recommended dose of his medicine.
二、函数方程不等式易错点
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