Etyl propionat là este có mùi thơm của quả dứa. Công thức của etylpropionat

A.  C 2 H 5 COOC 3 H 7

B.  C 3 H 7 COOC 2 H 5

C.  C 2 H 5 COOCH 3

D.  C 2 H 5 COOC 2 H 5

Một bộ acquy có suất điện động 12V nối vào một mạch kín. Thời gian dịch chuyến lượng điện tích này là 5 phút. Cường độ dòng điện chạy qua acquy này là

A. 0,2 A

B. 0,2 mA

C. 2 A

D. 12 A

My name is My. I live in Ha Tinh city

Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part is pronounced differently from others.

A. barred     

B. car  

C. charter    

D. back

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 33 to 38.

Sylvia Earle, a marine botanist and one of the foremost deep-sea explorers, has spent over 6,000 hours, more than seven months, underwater. From her earliest years, Earle had an affinity for marine life, and she took her first plunge into the open sea as a teenager. In the years since then she has taken part in a number of landmark underwater projects, from exploratory expeditions around the world to her celebrated “Jim dive” in 1978, which was the deepest solo dive ever made without cable connecting the diver to a support vessel at the surface of the sea.

Clothed in a Jim suit, a futuristic suit of plastic and metal armor, which was secured to a manned submarine, Sylvia Earle plunged vertically into the Pacific Ocean, at times at the speed of 100 feet per minute. On reaching the ocean floor, she was released from the submarine and from that point her only connection to the sub was an 18-foot tether. For the next 2½ hours, Earle roamed the seabed taking notes, collecting 15 specimens, and planting a U.S. flag. Consumed by a desire to descend deeper still, in 1981 she became involved in the design and manufacture of 20 deep-sea submersibles, one of which took her to a depth of 3,000 feet. This did not end Sylvia Earle’s accomplishments.

What will the paragraph following this passage probably be about?

A. Sylvia Earle’s childhood.

B. More information on the Jim suit

C. Earle’s achievements after 1981

D. How deep-sea submersibles are manufactured.