Cho m gam bột sắt vào dung dịch hỗn hợp chứa 0,16 mol Cu(NO₃)₂ và 0,4 mol HCl, lắc đều cho phản ứng xảy ra hoàn toàn. Sau phản ứng thu được hỗn hợp kim loại có khối lượng bắng 0,7m gam và V lít khí (đktc). Giá trị của V và m lần lượt là

A. 4,48 lít và 21,55 gam

B. 2,24 lít và 33,07 gam

C. 4,48 lít và 33,07 gam

D. 1,12 lít và 18,20 gam

Một quần thể giao phối ngẫu nhiên có thành phần kiểu gen 0,2 AA: 0,6 Aa: 0,2 aa. Giả sử các cá thể aa đều không có khả năng sinh sản. Nếu không phát sinh đột biến mới, không có di nhập gen, các cá thể có sức sống như nhau thì ở thế hệ F5 tỉ lệ kiểu gen đồng hợp trong quần thể là

A. 79/100.

B. 13/18

C. 149/200

D. 37/49

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

(A) A paragraph is a portion of a text (B) consists of one or more (C) sentences related (D) to the same idea.

A. A paragraph

B. consists of

C. sentences 

D. to

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

I was surprised that he knew a lot about Vietnamese culture.

A. I knew very little about Vietnamese culture, which surprised him. 

B. That he knew a lot about Vietnamese culture amazed me. 

C. I was surprised at his poor knowledge of Vietnamese culture

D. It astonished me that Vietnamese culture was what he liked most.

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

Hoa was late _________ her car was broken down.

A. because of

B. due to

C. because

D. owing to

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