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

Ambient divers are, unlike divers who go underwater in submersible vehicles of pressure resistant suits, exposed to the pressure and temperature of the surrounding ambient water. Of all types of diving, the oldest and simplest is free diving. Free divers may use no equipment at all, but most use a face mask, foot fins, and a snorkel. Under the surface, free divers must hold their breath. Most free divers can only descend 30 to 40 feet, but some skilled divers can go as deep as 100 feet.

Scuba diving provides greater range than free diving. The word scuba stands for self-contained underwater breathing apparatus. Scuba divers wear metal tanks with compressed air or other breathing gases. When using open-circuit equipment, a scuba diver simply breathes air form the tank through a hose and releases the exhaled air into the water. A closed-circuit breathing device, also called a rebreather, filters out carbon dioxide and other harmful gases and automatically adds oxygen. This enables the diver to breathe the same air over and over. In surface-supplied diving, divers wear helmets and waterproof canvas suits. Today, sophiticated plastic helmets have replaced the heavy copper helmets used in the past.These divers get their air from a hose connected to compressors on a boat. Surface-supplied divers can go deeper than any other type of ambient diver.

What does the word “descend” in the paragraph probably mean?

A. move to a lower level

B. climb to a higher place 

C. swim on the river bed

D. go up and down slowly

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 "norm" in paragraph 1 is closest in meaning to _________.

A. strange thing

B. unequal thing

C. changing thing

D. usual thing

Thực hiện các thí nghiệm sau:

(1) Đốt dây sắt dư trong khí clo

(2) Đốt nóng hỗn hợp bột Fe và S (trong điều kiện không có oxi)

(3) Cho FeO vào dung dịch HNO₃ (loãng dư)

(4) Cho Mg vào dung dịch Fe₂(SO₄)₃

(5) Cho Fe vào dung dịch H₂SO₄(loãng, dư)

(6) Nung hỗn hợp Fe và I₂ trong bình kín

Số thí nghiệm sau khi phản ứng hoàn toàn thu được muối sắt (II) là:

A. 2                             

B. 3                             

C. 4                             

D. 5

Các tua quấn ở các cây mướp, bầu, bí... là kiểu hướng động gì?

Cách nào sau đây điều chế được Na kim loại? 

A. Điện phân dung dịch NaCl

B. Điện phân NaOH nóng chảy

C. Điện phân dung dịch NaOH

D. Điện phân dung dịch NaNO₃