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【单选题】
Whether you are a smoker or non-smoker, you should take measures to protect your lungs. You can test your lung capacity by holding a lighted match about six inches from your face and trying to blow it out with your mouth wide open. If you cannot blow out the flame, arrange for a medical examination. Using a simple machine called a spirometer, a doctor can measure the lung's capacity and strength. In other words, he can test how efficiently you breathe. When combined with a complete physical examination, the spirometer test may detect or discover early signs of respiratory problems. Which sentence expresses the main idea?A.
Necessity is the mother of invention.
B.
An ounce of prevention is worth a pound of cure.
C.
Don’t count your chickens before they are hatched.
D.
We don't need doctors.
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举一反三
【多选题】下列对于税率的表述正确的有（ ）。
A.
比例税率是指对单位征税对象规定固定的税额
B.
定额税率是指对同一征税对象，不论其数量多少，数额大小，均按同一个比例征收的税率
C.
超额累进税率是指把征税对象按数额的大小划分为若干个等级，每一个登记规定一个税率，税率依次提高
D.
超率累进税率是指已征税对象数额的相对率划分若干级距，分别规定相应的差别税率，比如土地增值税
【多选题】查询出Employee表中查询出所有年龄(age)在25到35岁之间的员工信息(包含25岁和35岁)
A.
select * from Employee where age>=25 and age<=35
B.
select * from Employee where age>=25 or age<=35
C.
select * from Employee where age in(35,25)
D.
select * from Employee where age between 25 and 35
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