đường kính của một bánh xe đạp là 0, 65m.

a) tính chu vi của bánh xe đó.

b) Người đi xe đạp sẽ đi được bao nhiêu mét nếu bánh xe lăn trên mặt đất được 10 vòng, được 100 vòng?

Việt Nam chưa phải là nước xuất khẩu chủ yếu hàng hoá về

A. công nghiệp nặng và khoáng sản

B. công nghiệp nhẹ và tiểu thủ công nghiệp

C. nông, lâm, thuỷ sản    

D. công nghiệp chế tạo.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions

Belgium is a very old country, with a fascinating mixture of old customs and modern laws. Belgium weddings may be performed as a civil ceremony or as a religious ceremony.

Traditionally, when a couple in Belgium wishes to announce their marriage, the wedding invitations are printed on two sheets of paper, one from the bride's family and one sheet from the groom's family. These wedding invitations symbolize the union of the two families and the partnership of the new union.

An ancient Belgium custom that is designed to unite the two families calls for the bride to stop as she walks up the isle and to hand her mother a single flower. The two then embrace. Then, during the recessional, the bride and groom walk to the groom's mother and the new bride hands her new mother-in-law a single flower and the two of them embrace, symbolizing the bride's acceptance of her new mother.

One of the most important and enduring traditions of the Belgium wedding is for the bride to carry a specially embroidered handkerchief that has her name embroidered on it. After the wedding this handkerchief is framed and hung on the wall in a place of honor. When the next female member of the bride's family is to be wed, the handkerchief is removed from its frame, the new bride's name is embroidered onto it, and it is passed down. The wedding handkerchief is passed from generation to generation, and is considered an important family heirloom.

During the wedding mass, the bride and the groom are enthroned in two large chairs placed near the altar, symbolizing that on this day and in this place they are the king and the queen. At the conclusion of the ceremony, the groom slips the wedding ring onto the third finger of his bride's left hand. The ring, being an endless circle, symbolizes never-ending love, and the third finger of the left hand is believed to hold the vein that travels to the heart, symbolizing love. At the conclusion of the ceremony, the bride and groom share their first kiss as husband and wife. The kiss is considered a symbolic act of sharing each other's spirit as the couple each breathes in a portion of their new mate's soul.

The bridesmaids traditionally take up a collection of coins and as the bride and groom exit the church, the bridesmaids toss the coins to the poor outside the church. Giving gifts of money to the poor helps to insure prosperity for the new bride and groom.

Following the wedding the bride and groom are off on their honeymoon. In ancient times the honeymoon, which was celebrated by the drinking of mead, or honey wine, would last 28 days, one complete cycle of the moon. This was to make sure that the bride's family did not try to steal their daughter back from her new husband. 

The word "insure" in the paragraph 6 could be best replaced by _______ . 

A. determine 

B. indemnify 

C. express 

D. affirm

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.

TRAVELING TO WORK

If you were going to choose a job that involves travel, what would be your first choice? There are many jobs available today that give people opportunities to travel. Although may traveling careers sound fantastic, they also have disadvantages.

Being an au pair is an excellent way to not only go to different countries, but to live in different places around the world and really get a feel for the culture. Au pairs lives with the families they are placed with and take of children. Many parents include au pairs in family events and vacations, so they experience many aspects of the new culture while on the job. However, many of the activities are centered around the children, so they may not get to experience many things that interest adults.

For people who want a bit more freedom working abroad, being an English teacher maybe a good choice. There are English teaching jobs in almost countries in the world. People teaching English in other countries often have a chance to travel on the weekends around the country. One drawback is that many teachers often wind up hanging out with other English teachers, and they don’t have time to learn the country’s language.

The nickname “roadie” implies that this job involves life on the road. Roadies are people who work and travel with bands and provide technical support. Roadies can be lighting and stage crew who set up the stage and break it down before and after events. They can also be technicians helping band members with their instruments. International tours take a band’s crew to cities around the world, often requiring air travel. However, the crew doesn’t get much time off, so they may travel to several countries without seeing much besides concert venues and hotels.

Similarly, flight attendants often travel to cities around the world, but they don’t see much besides the inside of airplanes and hotels. However, when they do have time off, they can often fly at no cost, and family member can sometimes fly free as well. Its is widely thought that a flight attendant job is glamorous, but flight attendants must deal with travel hassles, as well as security issues.

All jobs gave advantages and disadvantages whether or not you travel for work, so if you have the travel bug, keep these jobs in mind for the future.

Which of the following is something a roadie might do?

A. set up the lights for a performance 

B. play the guitar in front of a large audience 

C. clean hotel rooms after the ban and crew have left 

D. work on the road

Em hãy nêu ưu, nhược điểm của các phương pháp nhân giống cây ăn quả.

Cho các chất sau: Cr(OH)₃, CaCO₃, Al(OH)₃ và Al₂O₃. Số chất vừa phản ứng với dụng dịch HCl, vừa phản ứng với dung dịch NaOH là

A. 3

B. 1

C. 2

D. 4

Cho các bệnh, tật và hội chứng di truyền sau đây ở Người:

1. Bệnh bạch tạng.

2. Tật có túm lông ở tai.

3. Bệnh ung thư máu.

4. Hội chứng Đao.

5. Hội chứng claiphentơ.

6. Bệnh mù màu.

Các bệnh, tật và hội chứng di truyền có thể gặp ở nữ giới là

A. 1, 3, 5, 6.

B. 1, 3, 4 ,6.

C. 1, 2, 3, 5.

D. 2, 3, 4, 6.

Ở một loài động vật, hiện tượng tương tác giữa 2 locus chi phối tính trạng màu sắc lông. Hai locus, mỗi locus gồm 2 alen là A/a và B/b tương tác theo mô hình: B- lông xám; b - lông đen, A - tạo enzyme phân giải các enzyme tạo màu sắc nên lông có màu trắng, a thì không có vai trò. Phép lai nào dưới đây tạo tỷ lệ kiểu hình 4 trắng: 3 xám: 1 đen?

A. AaBb (trắng) x Aabb (xám)  

B. AaBb (trẳng) x aaBb (xám)

C. AAbb (trắng) x AAbb (trắng)  

D. AaBB (trắng) x AABb (trắng)