mandatory rules

所给派生词缀的用法的词态学规则是哪些？

students end dorm life as soon as they can. Residence(住校)choices at U.S. colleges and universities are as different as the institutions themselves, but the first-year dorm experience is generally a mandatory rite(仪式)of passage. Students often complain about the space, but compared with most Chinese dorm rooms those in the U.S. are costly and satisfying. Most students spend their first year in a double room, usually with an area of somewhere between 12 and 15 square meters. A standard room includes a sink(washbasin), a telephone, a bunk-bed, two desks and two wardrobes. Rooms often come equipped with cable TV and broadband Internet access. Students usually provide other extras for themselves-they buy or rent a mini-refrigerator and bring along a carpet, a computer and audiovisual equipment. Roommates are usually chosen by chance from among all the new students at the university, so it's quite likely you won't share any classes with your roommate. It's not only the lack of space, but the many rules that make students feel they've had enough after a year. Rules on visitors of the opposite sex and alcohol are considered by many as the most bothersome(讨厌的)。 Some students put much effort into making their rooms different, especially by using paint, but this can lead to fines. Many students who leave move into an apartment or share a house with friends. This offers more freedom and sometimes even costs less than residence hall living. But a few grow fond of dorm life and stay on for another year or even longer. The most devoted go on to serve as resident assistants, the enforcers(执行者)of rules.

1.Students usually have dorm life for at least one year because ().

A.they have to

B.they like to try something new

C.they want to make new friends

D.their dorm life is quite satisfying

2.Which of the following is NOT true according to the passage？()

A.Students can have other residence choices after their fist-year dorm life

B.It's not necessary that you share a room with your classmates

C.Maybe boys are only allowed to visit girls at fixed time

D.No one would like to go on with their dorm life after first-year dorm life experience

3.Which of the following is probably NOT the reason why students end their dorm life as soon as possible？()

A.Rooms are too small

B.Their roommates are not friendly

C.They don't like the many rules there

D.It is more expensive.

4.What does the author want to tell us in the last paragraph？()

A.All students do enjoy their dorm life

B.Some students become the enforcers of rules

C.Though many students move out, there are some students who stay on

D.Students are allowed to stay on

5.What is the best title for the passage？()

A.Most U.S. Students Move Our of the Dorm

B.U.S. University Students Today

C.University Life in the U.S.

D.The U.S. University Students Need More Freedom

A.Account assignment category

B.Material Number

C.Storage location

D.Item category Service

ledge of English and paraphrase the given sentences in two different ways． 句法规则如何解释句子的模糊性？依靠你的英语语言学知识用两种不同方式解释所给句子。 (1)Smoking cigarettes can be nauseating． (2)Tony is a dirty street fighter． (3)After a two-day debate，they finally decided on the helicopter． (4)The man is too heavy to move． (5)The little girl saw the big man with the telescope．

____.

A) you get bored with the work B) you are not interested in the work

C) you can’t get additional allowance D) you have crucial family obligations

A.A limit value for unplanned services can be specified

B.Service specifications are required

C.A service master number is required

D.An account assignment is mandatory

E.The item category is D (service).

A．辅助通气（assisted ventilation,AV）

B．控制通气（controlled ventilation,CV）

C．辅助—控制通气（assit-controlled ventilation,A-CV）

D．间歇指令通气（intermittent mandatory ventilation,IMV）

E．压力支持通气（pressure support ventilation,PSV）

What' s the main purpose of this talk？

A．To explain why recycling important.

B．To describe the recycling program.

C．To discuss whether or not recycling should be mandatory (命令性的).

D．To explain how to find the recycling facilities.

固定规则(fixed rules)