问题 问答题 简答题

什么是时期数列和时点数列?二者相比较有什么特点?

答案

参考答案:

时期数列是指由反映现象在一段时期内发展过程总量的时期指标构成的动态数列。时点数列是指由反映现象在某一瞬间总量的时点指标构成的动态数列。二者相比较有以下特点:(1)时期数列的各指标值具有连续统计的特点,而时点数列的各指标值不具有连续统计的特点。(2)时期数列各指标值具有可加性的特点,而时点数列的各指标值不能相加。(3)时期数列的各指标值的大小与所包括的时期长短有直接的关系,而时点数列各指标值的大小与时间间隔长短无直接的关系。

单项选择题 A2型题
阅读理解

Homestay provides English language students with the opportunity to speak English outside the classroom and the experience of being part of a British home.

What to Expect

The host will provide accommodation and meals. Rooms will be cleaned and bedcovers changed at least once a week. You will be given the house key and the host is there to offer help and advice as well as to take an interest in your physical and mental health.

Accommodation Zones

Homestays are located in London mainly in Zones2,3 and of the transport system. Most hosts do not live in the town centre as much of central London is commercial and not residential(居住的). Zones3 and 4often offer larger accommodation in a less crowned area. It is very convenient to travel in London by Underground.

Meal Plans Available

♢ Continental Breakfast

♢ Breakfast and Dinner

♢ Breakfast, Packed Lunch and Dinner

It’s important to note that few English families still provide a traditional cooked breakfast. Your accommodation includes Continental Breakfast which normally consists of fruit juice, cereal(谷物类食品),bread and tea or coffee. Cheese, fruit and cold meat are not normally

part of a Continental Breakfast in England. Dinners usually consist of meat or fish with vegetables followed by desert, fruit and coffee.

Friends

If you wish to invite a friend over to visit.you must first ask your host’s permission.You have no right to entertain friends in a family home as some families feel it is an invasion of their privacy.

Self-Catering Accommodation in Private Homes

Accommodation on a room-only basis includes shared kitchen and bathroom facilities and often a main living room.This kind of accommodation offers an independent lifestule and is more suitable for the long-stay student.However,it does not provide the same family atmosphere as an ordinary homestay and may not benefit those who need to practise English at home quite as much.

小题1:The passage is probably written for       

A.host willing to receive foreign students

B.loreigners hoping to build British culture

C.travellers planning to vist famlies in London

D.English learners applying to like in English homes小题2:Which of the following will the host provide?

Room cleaning.

Medical care.

Free transport.

Physical trainning.

小题3:What can be inferred from Paragraph3?

A.Zone 4 is more crowded than Zone 2.

B.The business centre of London is in Zone.

C.Hosts dislike travelling to the city centre.

小题4:According to the passage. What does continental Breakfast include?

A.Dessert and coffee

B.Fruit and vegetables.

C.bread and fruit juice

D.Centre and cold meat.小题5:Why do some people choose self-catering accommodation?

A.To experience a warmer famliy atmosphere.

B.To enrich their knowledge of English\

C.To entertain friends as they like.

D.To enjoy much more freedom.