Gọi C là một điểm di động trên nửa đường tròn đường kính AB, kẻ CH vuông góc với AB tại H. Xác định vị trí của điểm C để AH + CH lớn nhất

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
The doctor asked John to exhale slowly.

A. imhale

B. move in

C. enter

D. breathe in

Nhiệt độ giảm và lương mưa thay đổi theo độ cao đã tạo nên các vành đai thực vật nào ở núi An-pơ?

Phát biểu không đúng là

A. Chất béo là trieste của glixerol và axit béo

B. Khi đun nóng chất béo với dung dịch NaOH hoặc KOH sẽ thu được xà phòng

C. Triolein có khả năng làm mất màu dung dịch nước brom

D. Chất béo (dầu, mỡ ăn) có thể dùng làm chất bôi trơn cho động cơ và ổ trục máy móc

Cấu hình electron của nguyên tử nguyên tố X là 1s²2s²2p⁶3s²3p¹. Số hiệu nguyên tử của X là

A. 14.

B. 15.

C. 13.

D. 27.

Đốt cháy m gam Fe trong không khí được 8,96 gam hỗn hợp A gồm bốn chất rắn. Cho 8,96 gam A tác dụng với lượng dư dd HNO₃ đặc nóng thu được 1,792 lít khí NO₂ duy nhất (đktc). Giá trị của m là:

A. 5,60

B. 6,72

C. 8,40

D. 1,50

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.

A recent study shows that an unequal share of household chores is still the norm in many households, despite the fact that many more women now have jobs. In a survey of 1,256 people ages between 18 and 65, men said they contributed an average of 37% of the total housework, while the women estimated their share to be nearly double that, at 70%. This ratio was not affected by whether the woman was working or not.

When they were asked what they thought was a fair division of labour, women with jobs felt that housework should be shared equally between male and female partners. Women who did not work outside the home were satisfied to perform 80% - the majority of the household work - if their husbands did remainder. Research has shown that, if levels increase beyond these percentages, women become unhappy and anxious, and feel they are unimportant.

After marriage, a woman is reported to increase her household workload by 14 hours per week, but for men the amount is just 90 minutes. So the division of labour becomes unbalanced, as a man's share increases much less than the woman's. It is the inequality and loss of respect, not the actual number of hours, which leads to anxiety and depression. The research describes housework as thankless and unfulfilling. Activities included in the study were cooking, cleaning, shopping, doing laundry, washing up and childcare. Women who have jobs report that they feel overworked by these chores in addition to their professional duties. In contrast, full-time homemakers frequently anticipate going back to work when the children grow up. Distress for this group is caused by losing the teamwork in the marriage.

The word "they" in paragraph 2 refers to________

A. men 

B. labour 

C. jobs

D. women 

Dung dịch nào sau đây có phản ứng tráng bạc?

A. Metylaxetat

B. Glyxin

C. Fructozơ

D. Saccarozơ