Các gốc ankyl sau đây có tên tương ứng là :

A. (1) : iso-butyl; (2) : neo-butyl; (3) : iso-propyl; (4) : sec-butyl; (5) : n-butyl

B. (1) : iso-butyl; (2) : tert-butyl; (3) : iso-propyl; (4) : sec-butyl; (5) : n-butyl

C. (1) : sec-butyl; (2) : tert-butyl; (3) : iso-propyl; (4) : iso-butyl; (5) : n-butyl

D. (1) : iso-butyl; (2) : tert-butyl; (3) : sec-propyl; (4) : sec-butyl; (5) : n-butyl

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:What is the best title for the passage?

A.  Symbolism of the Great Pyramid

B.  Problems with the Construction of the Great Pyramid

C.  Wonders of the Great Pyramid of Giza

D.  Exploration of the Burial Chamber of Cheops

Cho biết mỗi cặp gen quy định một cặp tính trạng, alen trội là trội hoàn toàn. Ở đời con của phép lai AaBbDd x AaBBdd, loại kiểu hình có 2 tính trạng trội và một tính trạng lặn chiếm tỉ lệ:

A. 12,5%.

B. 50%.

C. 18,75%.

D. 37,5%.

Hợp chất hữu cơ E có công thức phân tử C 4 H 8 O 2   đơn chức no, mạch hở, tác dụng được với NaOH,  không tác dụng với Na,  không tác dụng với dung dịch AgNO 3 /NH 3  . Số đồng phân cấu tạo của E phù hợp với các tính chất trên là:

A.5

B.3. 

C. 4. 

D.2.

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

_______ appear, they are really much larger than the Earth.

A. Small as the stars

B. The stars as small

C. As the small stars

D. Despite of the small stars

Kết quả thí nghiệm của các dung dịch X, Y, Z với thuốc thử được ghi ở bảng sau:

Dung dịch X, Y, Z lần lượt là

A. Ba(HCO₃)₂, K₂SO₄, NaHCO₃.

B. Ba(OH)₂, MgCl₂, Al₂(SO₄)₃.

C. MgCl₂, Na₂CO₃, AgNO₃

D. Ba(OH)₂, Na₂CO₃, MgCl₂