Farmers can produce more by planting several different crops in the same field.But their success depends on which crops they plant together and how they mix (混合) them in the filed.In the past, the only way the farmers could learn which crops grow best together is to plant them and wait for the results.Now, however, a computer can give them answers.A new computer program written by Dr John Vanderwell of Michigan University can tell a farmer which plants grow well together and which do not.It can tell him how to plant the different crops; if he should plant each in a separate row, or mix the crops in the same row.It can tell the farmer how changes in planting each of the crops will affect the production of all of them.And it can tell him which plants can help reduce losses (损失) from diseases.

1.Which of the following best gives the main idea of the passage?

A．Computer helps find the best program for mixing plants.

B．Computer helps produce more crops.

C．Computer helps protect against insects and diseases.

D．Computer helps grow different plants.

2.According to the passage, to get the best result, one needs to choose carefully ________.

A．the kinds of crops to be planted together

B．the way for different crops to be mixed

C．both A and B

D．either A or B

3.It seems the new computer program can NOT tell us ________.

A．whether we should grow cotton and tomato together

B．how we should plant cotton and tomato together

C．what will happen if we grow potato, instead of tomato, together with cotton

D．how we can grow rice in the tomato field

4.The new computer program seems most useful in saving us ________.

A．man power        B．seeds             C．time             D．land

5.Which of the following is NOT true?

A．Computers can tell farmers how many plants can grow together.

B．With the help of computers farmers don't have to do a lot of work.

C．With the help of computers farmers can get better results.

D．The change of one plant may cause a change in production.

　In Mr．Allen’s high school class , all the students have to “get married ．”However , the wedding ceremonies are not real ones but imitations ． These 1ceremonies sometimes become so noisy that the loud laughter 2the voice of the“minister．”

　Even the two students 3often begin to giggle ． The teacher , Mr．Allen , believes that marriage is a difficult and serious business ． He wants young people to understand that there are many changes that must 4after marriage ． He believes that the need for these psychological and financial 5should be understood before people marry ．

　Mr．Allen doesn’t only 6his students to major problems 7in marriage 8 illness or unemployment ． He also 9 to the 10problems they will face every day ． He wants to introduce young people to all the 11that can strain a marriage to the breaking 12． He even familiarizes his students with the problems of divorce and the fact that 13men must pay child support money for their children and sometimes pay monthly 14 to their wives ．

　It has been 15for some of the students to see the problems that a 16couple often faces ． Until they took the 17, they had not 18much about the problems of marriage ． However , both students and parents feel that Mr．Allen’s course is valuable and have 19the course publicly ． Their statements and letters supporting the class have convinced the school to 20 the course again．

1．A．false B．imitation C．unreal D． untrue

2．A．buries B．covers up C．drowns out D． floods

3．A．being married B．getting married C．to get married D． to be getting married

4．A．Appear B．happen C．come into being D． take place

5．A．Additions B．changes C．judgments D． operations

6．A．refer B．lead C．introduce D． guide

7．A．face B．faced C．facing D． to be faced

8．A．for example B．for instance C．e．g． D． such as

9．A．keeps them in the dark B．Asks them to stay behind

　C．lets them remain　　 D． leaves them uncovered

10．A．basic B．necessary C．important D． pressing

11．A．Anger-causing troubles B．discomfort-causing troubles

　C．either A or B　　　　 D． both A and B

12．A．dot B．drop C．edge D． point

13．A．divorce B．divorces C．divorced D． divorcing

14．A．extra money B．pocket money C．hard-earned money D． support money

15．A．settled B．unsettled C．settling D． unsettling

16．A．marrying B．being married C．getting married D． married

17．A．course B．lesson C．lecture D． subject

18．A．Anxious B．eager C．doubted D． worried

19．A．praised B．prized C．prided D． supported

20．A．offer　　B．take　　C．Attend D． plan

　　A superstition about moles says that when a woman is frightened before the birth of her child, the child will have a mole on his body． The mole is often supposed to have the outline of the thing that frightened the mother! In fact, no one knows why moles appear or how to prevent them．

　　The average number of moles a person has is fourteen． Moles can appear on almost any part of the body, including the scalp． A mole is a tissue growth． Blood vessels, cells containing pigment, hair-follicle cells, or connective tissue can form moles． Therefore moles can be of different types．

　　As most moles never cause any health hazard, it is best to leave them alone． But when a mole is irritated or injured, it is better to have it removed． Moles on the soles and palms are subject to irritation． They should be removed before the person reaches teen age． And any mole that shows an increase in size, or a change in color, or that scales, itches, or bleeds should also be surgically removed．

1．According to the superstition, a cat shaped mole proves that a person's mother______．

A．is scared of all cats B．was frightened by a cat C． hates cats D．likes some cats

2．According to the article, no one has yet discovered______．

A．why moles appear B． how to prevent moles C． what moles are D． Both A and B

3．If the superstition about moles were true, most women before giving birth would suffer about______．

A． 4 frights　　 B．14 frights　　 C．24 frights　　 D．34 frights

4．A mole on the scalp is probably a_____．

A．common occurrence B． beauty mark C．Either A or B D．Neither A nor B

5．All moles grow from_____．

A．blood vessels B．pigment cells C． tissue D．hair follicles

6．You would probably have a mole removed if its location were the_____．

A． waistline B． back　　C． abdomen D． leg

7．It is wise to have moles removed if they_____．

A．change in color B． increase in size C． start to bleed D． Any of the above

8．The author does not say it is wise to remove moles that______．

A．are on the soles of the feet B． are on the palms of the hands

C．disfigure the faceD． start to itch