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

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 scientiííc 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?

Question:On what did the ancient Egyptians base their calculations?

A. Observation of the celestial bodies

B. Advanced technology

C. Advanced tools of measurement

D. knowledge of the earth’s surface

Hỗn hợp X gồm metyl fomat, anđehit acrylic và axit metacrylic. Đốt cháy hoàn toàn m gam X rồi hấp thụ hết sản phẩm cháy vào 70 ml dung dịch Ca(OH)₂ 1M, thu được 5 gam kết tủa và khối lượng phần dung dịch tăng thêm 0,22 gam. Giá trị của m là

A. 1,54.

B. 2,02.

C. 1,95.

D. 1,22.