Quặng boxit được dùng để sản xuất kim loại nào sau đây?

A. Mg.        

B. Na.         

C. Al.          

D. Cu.

a nối 1

b nối 1

c nối 2

~Tick mk nha~

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 23 to 29.

        For more than six million American children, coming home after school means coming back to an empty house. Some deal with the situation by watching TV. Some may hide. But all of them have something in common. They spend part of each day alone. They are called “latchkey children”. They are children who look after themselves while their parents work. And their bad condition has become a subject of concern.

      Lynette Long was once the principal of an elementary school. She said, “We had a school rule against wearing jewelry. A lot of kids had chains around their necks with keys attached. I was constantly telling them to put the keys inside shirts. There were so many keys; it never came to my mind what they meant.” Slowly, she learned that they were house keys.

        She and her husband began talking to the children who had keys. They learned of the effect working couples and single parents were having on their children. Fear was the biggest problem faced by children at home alone. One in three latchkey children the Longs talked to reported being frightened. Many had nightmares and were worried about their own safety

       The most common way latchkey children deal with their fears is by hiding. They may hide in a shower stall, under a bed or in a closet. The second is TV. They often turn the volume up. It’s hard to get statistics on latchkey children, the Longs have learned. Most parents are slow to admit that they leave their children alone.

One thing that the children in the passage share is that___________.

A. they all wear jewelry

B. they spend part of each day alone

C. they all watch TV

D. they are from single-parent families

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks

                                                    THE EARTH GALLERIES
To many people, the word ‘geology’ conjures up rather dull image of lumps of rock in glass cases. People tend to regard geology as an academic subject that you don’t need to know about (56)________you have to study it at school. If you visit te Earth Galleries at London’s Natural history Museum, however, you’ll (57)________that this image couldn’t be further from the truth.

      The aim of the exhibition is not to procedure future geologists, but rather to inspire interest in a subject which is relevant to everyday life. The Earth Galleries turn the traditional idea of geological museum (58)________, literacy because you begin at the top. The central space in the museum is a glass-topped atrium. As you enter, you (59)________up to the top of this by escalator. On the (60)________, the escalator passed through a massive revolving globe, measuring eleven metres (61)________diameter. This represents a planet, not necessarily the Earth. (62)________at the top, you work your way down through the six different exhibitions that (63)________the museum.

      The individual exhibitions explain natural phenomena such as earthquakes and volcanoes as well as looking at the Earth’s energy (64)________and where our most common building (65)__________come from. These exhibitions allow everyone to appreciate the fascination of geology. 
Question 64

A. treasures

B. talents

C. resources

D. reservations

Đốt cháy hoàn toàn hỗn hợp X gồm 2 este no, đơn chức kế tiếp nhau trong dãy đồng đẳng thu được m gam H₂O và 22,4 lít khí CO₂ (đktc). Giá trị của m là:

A. 18 

B. 36 

C. 9 

D. 27 

Đốt cháy hoàn toàn a gam hỗn hợp các este no, đơn chức, mạch hở. Sản phẩm cháy được dẫn vào bình đựng dung dịch nước vôi trong, thấy khối lượng bình tăng 6,2 gam, số mol của CO₂ và H₂O sinh ra lần lượt là 

A. 0,1 và 0,1 mol

B. 0,1 và 0,01 mol

C. 0,01 và 0,1 mol

D. 0,01 và 0,01 mol

Một phân tử saccarozơ có

A. một gốc a-glucozơ và một gốc β-fructozơ

B. hai gốc α-glucozơ

C. hai gốc α-glucozơ

D. một gốc β-glucozơ và một gốc α-fructozơ