Tìm lỗi và sửa cho đoạn văn sau:

Professor Sanchez gave a lecture on transitors last Tuesday. First, he explained what are transistors. He said, that they are very small electronic devices used in telephones, automobiles radios and so on. He further explained that transitors control the flow of electric current in electronic equipment. He wanted to know which popular technological invention cannot operate without transistors. Most students agreed, it is the personal computer. Professor Sanchez then asked if the students know how do transitors function in computers. He said that the transitors were etched into tiny silicon microchips and that these transistors increase computer’s speed and data storage capacity. Then he asked the class when had transitors been invented. Sergei guessed that they were invented in 1947. The professor said that he is correct. Professor Sanchez then asked what was the importance of this invention. Many students answered that it is the beginning of the information age. At the end of the lecture, the professor assigned a paper on transistors. He requested that each student chooses a topic by next Monday. He suggested that the papers are typed.

Xác định mệnh đề danh từ trong bài sau:

Some people believe that children should spend all of their free time with their families. Others believe that this is unnecessary or even negative. Discuss the possible arguments on both sides, and say which side you personally support.

Nobody can deny that parental influence is important for children, at least in cases where children live with their parents, foster parents or guardians. However, it is by no means clear that children should spend exclusively in the family, as we will see.

On the one hand, it may appear advisable for parents to act as role models and establish ground rules for behaviour by spending as much time as possible with their children. This allows the youngers follow themselves, hopefully leading to an absence of problems such as bullying, truancy and deliquency later on. Furthermore, being with the family should reduce the risk of children falling victim to crimes such as abduction, or coming under the influence of negative peer pressure.

On the other hand, we have to ask whether this is a practical proposition. In a society where many families are dual-income, or where one parents’s role as breadwinner means he/she is away from the family for long periods, it is inevitable that children cannot spend all of their time with the family. Child-minding and after-school childcare are often used in these cases, and if managed properly, these can be perfectly viable alternatives. Equally, it seems that children can in some cases learn a considerable amount from their peers in addition to adults, and allowing them to play without direct supervision may be a benefit.

To conclude, it appears that while family time is essential for bonding and absorbing patterns of behaviour, there are definite advantages when children are outside the family too. This is provided that (only if) they are in a safe, well-behaved environment with peers who are themselves reasonably well brought-up.

Dùng “I want to know” và mệnh đề danh từ If/ Whether để viết lại các câu sau: Mệnh đề quan hệ 1. Is acupuncture a risky medical procedure? 2. Are the needles made of Stainless steel or of some other metal? 3. Do the needles hurt when they are inserted? I want to know if the needles hurt when they are inserted 4. Has the effectiveness of acupuncture in relieving back pain ever been documented? 5. Can acupuncture strengthen the immune system? 6. Does acupuncture use the body’s energy to promote healing? 7. Did you study acupuncture in China or in the United States? 8. Have you ever used acupuncture during an operation?

so sánh thành tựu văn minh phương đông và phương tây trên các lĩnh vực

Phân tích sự phù hợp giữa cấu tạo và chức năng của bộ máy golgi

Có