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.

Clara Barton became known as “The Angel of the Battlefield” during the American Civial War. Born in Oxford, Massachusetts in 1821, Clara Barton’s interest in helping soldiers on the battlefield began when she was told army stories from her father. Another event that influenced her decision to help soldiers was an accident her brother had. His injuries were cared for by Barton for 2 years. At the time, she was only 11 years old. Barton began teaching school at the age of 15. She taught for 18 years before she moved to Washington, D.C. in 1854.

The civil war broke out 6 years later. Immediately, Barton started was service by helping the soldiers with their needs. At the battle of Bull Run, Clara Barton received permission from the government to take care of the sick and hurt. Barton did this with great empathy and kindness. She acknowledged each soldier as a person. Her endurance and courage on the battlefield were admired by many. When the war ended in 1865, she used 4 years of her life to assist the government in searching for soldiers who were missing during the war.

The search for missing soldiers and years of hard work made her feeble physically. In 1869, her doctors recommended a trip to Europe for a rest. While she was on vacation, she became involved with the International Red Cross, an organization set up by the Geneva Convention in 1864. Clara Barton realized that the red Cross would be a big help to the United States. After she returned to the United States, she worked very hard to create an American red Cross. She talked to government leaders and let American people know about the Red Cross. In 1881, the Notional Society of the Red Cross was finally established with its headquarters in Washington, D.C. Clara Barton managed its activities for 23 years.

 Barton never let her age stop her from helping people. At the age of 79, she helped flood victims in Galveston, Texas. Barton finally resigned from the Red Cross in 1904. She was 92 years old and had truly earned her titled “The Angel of the Battlefield”.
What is the main idea of the passage?

A. Clara Barton helped wounded soldiers and she was the founder of the Red Cross

B. Clara Barton was a kind and strong woman who helped people in need

C. Clara Barton became a nurse during the American Civil War

D. Clara Barton worked for disaster victims until she was old

Sục khí CO 2  vào V lít dung dịch hỗn hợp NaOH 0,2 M và Ba OH 2  0,1M. Đồ thị biểu diễn khối lượng kết tủa theo số mol CO 2  như sau:

Giá trị của V là :

A. 300

B. 250.

C. 400

D. 150

Hỗn hợp X gồm axit panmitic, axit stearic và axit oleic. Để trung hoà m gam X cần 40 ml dung dịch NaOH 1M. Mặt khác nếu đốt cháy hoàn toàn m gam X thì thu được 15,68 lit khí CO₂ (đktc) và 12,42 gam H₂O. Phần trăm số mol của axit oleic trong hỗn hợp X là:

A. 12,5%

B. 37,5%

C. 25%

D. 18,75%

Cho 3x^2-6x=0

=> 3x.x-6x=0

=>x(3x-6)=0(áp dụng phép phân phối)

=>x=0 và 3x-6=0

3x=6

x=6/3=2

VẬY: x=0 hay x=2 là nghiệm của đa thức

Thủy phân hoàn toàn triglixerit X trong dung dịch NaOH dư, thu được 4,6 gam glixerol và m gam hỗn hợp hai muối gồm natri stearat và natri oleat có tỉ lệ mol tương ứng là 1: 2. Giá trị của m là 

A. 44,3 gam

B. 45,7 gam

C. 45,8 gam

D. 44,5 gam

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 following questions.

         In the past, British children were frequently encouraged to try out their performing skills for the benefit of adults. They did this by reading aloud, acting or ___(5)___ a musical instrument. As they (6) _____ up they were taken to public places of entertainment - the theatre, opera, circus or ballet.

       They looked forward to these ___(7)___ with great ___(8)__ and would remember and discuss what they had seen for many weeks afterwards. But nowadays television and computers ____(9)____ an endless stream of easily available entertainment, and children quickly accept these marvelous inventions  as a very ordinary part of their everyday lives. For many children, the sense of witnessing a very special live performance is gone forever.

Điền vào số (6)

A. developed       

B. brought 

C. advanced         

D. grew