Tro thực vật cũng là một loại phân kali có chứa

A. KNO₃

B. KCl

C. K₂CO₃

D. K₂SO₄

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 45 to 54

THE DANGERS OF DIETING

Thanks to our modern lifestyle, with more and more time spent sitting down in front of computers than ever before, the (43)____ of overweight people is at a new high. As people frantically search for a solution (44)____ this problem, they often try some of the popular fad diets being offered. Many people see fad diets (45)____ harmless ways of losing weight, and they are grateful to have them.Unfortunately, not only don’t fad diets usually (46)____ the trick, they can actually be dangerous for your health.

Although permanent weight loss is the (47)___, few are able to achieve it. Experts estimate that 95 percent of dieters return to their starting weight, or even (48)____ weight. While the reckless use of fad diets can bring some (49)____ result, long-term results are very rare. (50)____, people who are fed up with the difficulties of changing their eating habits often turn to fad diets. (51)____ being moderate, fad diets involve extreme dietary changes. They advises eating only one type of food, or they prohibit other types of foods entirely. This results in a situation (52)______ a person’s body doesn’t get all the vitamins and other things that it needs to stay healthy.

Điền vào ô số 52

A. Additionally 

B. Furthermore 

C. Nonetheless

D. Consequently

Cho sơ đồ chuyển hoá sau :

C₃H₄O₂ + NaOH ®   X + Y                             

X + H₂SO₄ loãng  ®   Z + T

Biết Y và Z đều có phản ứng tráng gương. Hai chất Y, Z tương ứng là :

A. CH₃CHO, HCOOH

B. HCHO, HCOOH

C. HCOONa, CH₃CHO

D. HCHO, CH₃CHO

Các kim loại X, Y, Z có cấu hình electron nguyên tử lần lượt là : 1s²2s²2p⁶3s¹; 1s²2s²2p⁶3s²; 1s²2s²2p⁶3s²3p¹. Dãy gồm các kim loại xếp theo chiều tăng dần tính khử từ trái sang phải là 

A. Z, Y, X

B. X, Y, Z

C. Z, X, Y

D. Y, Z, X