8点50分可读作：eight fifty; ten to nine(英式说法)；ten before nine(美式说法)
1点40分可读作：one forty; twenty to two(英式说法)；twenty before two(美式说法)
“提前半小时”可用：half an hour early; thirty minutes early; early by half an hour; half an hour ahead of time; half an hour ahead of schedule等来表示。)
时间表示法和时段的简单运算是听力考试的热点，请看下面的对话：
W: How long does the class usually last?
M: Umm, let me think. It starts from a quarter to nine, and ends at nine thirty. So...
W: That is fortyfive minutes. Thank you very much!
Q: When does the class usually start?
3.英语中货币的表达方法
英国货币：penny(便士)/pence (penny的复数)，pound (￡)
￡20.50：twenty pounds fifty pence，也可以简单地写作：twenty fifty
美国货币：
1美元钞票a S｜1.00 bill
1 dollar=100 cents
(S｜1.00=one dollar)
(S｜2.00=two dollars)
25美分1 quarter
10美分1 dime
5美元1 nickel
1美分1 penny
S｜15.95：fifteen dollars ninety-five cents，或fifteen ninety-five.
(注：表示正常价格: regular price, normal price.
表示价格划算：a good buy, a better buy, an excellent price, a good price/ bargain.
表示价格较贵：dear, expensive, more expensive, steep.
表示价格便宜：cheap, inexpensive, bargain price, less expensive.
表示减价出售：sale price, on sale, garage sale, Christmas sale, special price.
词组：discount, half, double, cut off, knock off, twice as much as ,cross off, etc.)
4.英语中关于数字及其计算的听力考点
(1)数字辨别：
有关数字辨别的一个关键考点就是类似30/13，40/14，50/15，60/16的听音，看大家能否听出其发音区别。听力理解中难以分辨的基数词主要有以下几对：
thirteen与thirty; fourteen与forty; fifteen与fifty; sixteen与sixty; seventeen与seventy;eighteen与eighty; nineteen与ninety，在英文中这几对数词叫做teens and tens(十几与几十)。
不管加减还是乘除，这类题中至少会出现两个数字，你的任务就是迅速地判断这两者的关系，然后根据听音再确定正确选项。
(2)加减法计算：
在需要简单的加减法计算的题型中，对话中至少出现两个数字，它们之间的关系往往用“多少”、“迟早”、“快慢”、“前后”的形容词、副词或介词短语等来表达。还要注意一些能够表示数的存在或引起数的变化的动词，这些动词也能确定数字之间的加减关系，例如：
be, have, start, begin, spend, miss, leave, postpone, prolong, increase, add, borrow, lend, loan, delay, save, go up, go down, rate, at x% off the price等。
大家还应该记住下面这些表示加减关系的词：
more(多)，less(少)，late(晚)，early(早)，fast(快)，slow(慢)，before(前)，after(后)，add/addition(加上)，plus(加上)，subtract/ subtraction(减去)，minus(减去)
Dialogue 1:
M: This black bag is 2.00 and that blue one is a dollar more.
W: The red one is twice as much as the blue one.
Q: How much are two red bags?
