Xà phòng được điều chế bằng cách

A. phân hủy mỡ. 

B. thủy phân mỡ trong kiềm

C. phản ứng của axít với kim loại.

D. đehidro hóa mỡ tự nhiên

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

…………….., she received a big applause.

A. Finished her lecture

B. Speaking has finished

C. After she finishes speaking

D. When the speaker finished

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 25 to 29. Fill in the appropriate word in question 25

Keeping the World in Our Pockets

Faster processors and advances in memory technology have made today’s smartphones much more powerful than a lot of computers from just a decade ago. With wireless technology, people can surf the Internet, play online games, send e-mail, and do (25) _____ all the things they once could only do on a computer. (26) _____, they have the power to do things constantly at their fingertips.

Many people (27) ____ that while smartphones are powerful tools, they are making people reliant on them. Why would a person need to learn to read a map when he can get directions to anywhere by simply asking his phone a question? Who needs to learn maths when you have immense calculating power in your pocket at all times? What (28) _____ is there to memorise facts about history, art, or geography when that information is readily available from a portable Internet interface?

There are just some of the questions being asked and answered as smartphone usage continues to spread. Like any technology, smartphones have their advantages, but they do have disadvantages as well that we must (29) _____ an eye on.

A. practically

B. suitably

C. effectively

D. most

X, Y, Z là 3 este đều hai chức, mạch hở và không chứa nhóm chức khác. Đốt cháy x gam hỗn hợp E chứa X, Y, Z cần dùng 1,2 mol O₂. Mặt khác đun nóng x gam E với 480 ml dung dịch NaOH 1M. Trung hòa lượng NaOH dư cần dùng 120 ml dung dịch HCl 1M, cô cạn dung dịch sau khi trung hòa thu được hỗn hợp F chứa 2 ancol đều no, kế tiếp thuộc cùng dãy đồng đẳng và hỗn hợp chứa 2 muối có khối lượng 35,82 gam. Lấy F đun với H₂SO₄ đặc ở 140⁰C thu được hỗn hợp chứa 7,05 gam 3 ete. Hiệu suất ete hóa của ancol có khối lượng phân tử nhỏ là 75%, hiệu suất ete hóa của ancol còn lại là?

A. 75%

B. 60%

C. 80%

D. 90%

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 36 to 43.

One of the seven wonders of the ancient world, the Great Pyramid of Giza was a monument of wisdom and prophecy built as a tomb for Pharaoh Cheops in 2720 B.C. Despite its antiquity, certain aspects of its construction makes it one of the truly wonders of the world. The thirteen- acre structure near the Nile river is a solid mass of stone blocks covered with limestone. Inside are the number of hidden passageways and the burial chamber of the Pharaoh. It is the largest single structure in the world. The four sides of the pyramid are aligned almost exactly on true north, south, east and west-an incredible engineering feat. The ancient Egyptians were sun worshippers and great astronomers, so computations for the Great Pyramid were based on astronomical observations.

Explorations and detailed examinations of the base of the structure reveal many intersecting lines. Further scientific study indicates that these represent a type of timeline of events - past, present and future. Many of the events have been interpreted and found to coincide with known facts of the past. Others are prophesied for future generations and are currently under investigation. Many believe that pyramids have supernatural powers and this one is no exception. Some researchers even associate it with extraterrestrial beings of ancient past.

        Was this superstructure made by ordinary beings, or one built by a race far superior to any known today?

What has research of the base revealed?

A. There are cracks in the foundation

B. Tomb robbers have stolen the Pharaoh's body

C. A superior race of people built in

D. The lines represent important events