Cách nhận biết rõ rệt nhất thời điểm cần bón phân là:

A. Căn cứ vào dấu hiệu bên ngoài của quả mới ra.

B. Căn cứ vào dấu hiệu bên ngoài của thân cây.

C. Căn cứ vào dấu hiệu bên ngoài của hoa.

D. Căn cứ vào dấu hiệu bên ngoài của lá cây.

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.

  When I was at school, sports day was the highlight of the year. Let me set the scene. First of all, on sports day, it was always bound (26) ___________       rain. Sunny weather? No such luck. Despite the previous two months of soaring temperatures, as likely as not, on the morning of the games, The temperature would plummet. So, imagine a hundred (27) ___________ small children, dressed in tight shorts and thin vests, shivering in the cold, unaware of the heartbreak that lies in store for them. Swept up by the excitement and desperate to win, tempers soon get frayed. One girl finds herself disqualified from the egg and spoon race despite giving it everything she’s got, and another boy, (28)_____ jealous of the winner of the sack race, makes the mistake of being rude to him within earshot of the teachers. Scores of tiny children, bitterly disappointed at tasting defeat for the first time, break down and cry. Twenty years on, I’m certainly not (29) ___________ any young, but I do have some really lasting (30) _______ of those days at school!

Điền vào ô trống 29

A. putting

B. getting

C. going

D. coming

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.

  When I was at school, sports day was the highlight of the year. Let me set the scene. First of all, on sports day, it was always bound (26) ___________       rain. Sunny weather? No such luck. Despite the previous two months of soaring temperatures, as likely as not, on the morning of the games, The temperature would plummet. So, imagine a hundred (27) ___________ small children, dressed in tight shorts and thin vests, shivering in the cold, unaware of the heartbreak that lies in store for them. Swept up by the excitement and desperate to win, tempers soon get frayed. One girl finds herself disqualified from the egg and spoon race despite giving it everything she’s got, and another boy, (28)_____ jealous of the winner of the sack race, makes the mistake of being rude to him within earshot of the teachers. Scores of tiny children, bitterly disappointed at tasting defeat for the first time, break down and cry. Twenty years on, I’m certainly not (29) ___________ any young, but I do have some really lasting (30) _______ of those days at school!

Điền vào ô trống 28

A. fiercely

B. warmly

C. keenly

D. strongly

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.

  When I was at school, sports day was the highlight of the year. Let me set the scene. First of all, on sports day, it was always bound (26) ___________       rain. Sunny weather? No such luck. Despite the previous two months of soaring temperatures, as likely as not, on the morning of the games, The temperature would plummet. So, imagine a hundred (27) ___________ small children, dressed in tight shorts and thin vests, shivering in the cold, unaware of the heartbreak that lies in store for them. Swept up by the excitement and desperate to win, tempers soon get frayed. One girl finds herself disqualified from the egg and spoon race despite giving it everything she’s got, and another boy, (28)_____ jealous of the winner of the sack race, makes the mistake of being rude to him within earshot of the teachers. Scores of tiny children, bitterly disappointed at tasting defeat for the first time, break down and cry. Twenty years on, I’m certainly not (29) ___________ any young, but I do have some really lasting (30) _______ of those days at school!

Điền vào ô trống 27

A. enthusiast

B. enthusiastic

C. enthuse

D. emthusiasm

Dãy gồm các chất được sắp xếp theo chiều tăng dần nhiệt độ sôi từ trái sang phải là 

A. CH₃COOH, C₂H₅OH, HCOOH, CH₃CHO.

B. CH₃CHO, C₂H₅OH, HCOOH, CH₃COOH.

C. CH₃COOH, HCOOH, C₂H₅OH, CH₃CHO

D. HCOOH, CH₃COOH, C₂H₅OH, CH₃CHO

4

Khi nói về chọn lọc tự nhiên (CLTN), phát biểu nào sau đây đúng?

A. Tất cả các alen lặn đều bị chọn lọc tự nhiên loại bỏ

B. Chọn lọc tự nhiên quy định chiều hướng tiến hóa

C. Chọn lọc tự nhiên có thể tạo ra một số kiểu gen thích nghi

D. Chọn lọc tự nhiên chỉ loại bỏ kiểu hình mà không loại bỏ kiểu gen

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.

Một phân tử mARN nhân tạo có tỉ lệ các loại nucleotit A : U : G : X = 4 : 3 : 2 : 1. Có bao nhiêu phát biểu sau đây là đúng khi nhận xét về mARN trên?

(1) Tỉ lệ bộ mã có chứa 2A và 1G nhỏ hơn 10%.

(2) Tỉ lệ bộ mã có chứa 2U lớn hơn 20%.

(3) Tỉ lệ bộ mã có chứa A là 80%.

(4) Tỉ lệ bộ mã có chứa 3A là 6,4%.

A. 1

B. 2

C. 3

D. 4