CTTQ của ancol bậc 1 no, đơn chức là:

A.  C n H 2 n + 1 OH   ( n   ≥   1 ) .

B.  R - CH 2 OH  (R là H hoặc gốc HC).

C.  C n H 2 n + 1 CH 2 OH   ( n   ≥   0 ) .

D.  C n H 2 n CH 2 OH   (   n   ≥   0 ) .

Listen to John Keith, a fitness instructor, talking about four types of physical activity. Listen carefully and fill in the blanks with ONE word for each blank. Your browser does not support the audio element.

My name’s John Keith and I’ve been a fitness instructor for more than ten years. Today I’d like to talk about the precautions we all need to take when doing different types of physical activity. Aerobic exercise seem very simple and easy to do. However, studies have shown that if you do your(1)_________outdoors in the hot and sunny weather, your body can overheat and lose a lot of fluid. This can lead to heat stroke. You should drink a glass of water before a workout and then pase regularly to drink more. You should also exercise early in the(2)________when it’s not too hot. Next is simming. It’s very important to be safe in the water. Swimming pools may look safe, but you should always(3)________the pool water before jumping in. Cold water can make your blood pressure and heart rate go(4)_______. Make sure you have warmed up your boby by stretching or jumping. Don’t swim in bad weather, especially in the rivers, lakes or the sea. If you are swimming and lightning strikes, you risk serious(5)_______or death.

Now, how about yoga? This exercise may look easy and suitable for people of all(6)_____. However, if it’s not done properly, it can do more(7)_______than good. You need to do some warm-up exercise such as stretching before you start your yoga practice. This will relax your(8)____and prevent any dammage to your joints.__________ The last type of physical activity is fitness(9)_______. First, you need good(10)______to keep you comfortable and pain-free. Next, when yo walk, don’t look at your feet. This will slow you down and cause back pain. Finally, remember to bring water with you and drink at least 150ml for every 15 minutes of walking. That’s all from me for today. Hope you find these safety precautions useful. Thanks for listening.

Question 6:

Listen to John Keith, a fitness instructor, talking about four types of physical activity. Listen carefully and fill in the blanks with ONE word for each blank. Your browser does not support the audio element.

My name’s John Keith and I’ve been a fitness instructor for more than ten years. Today I’d like to talk about the precautions we all need to take when doing different types of physical activity. Aerobic exercise seem very simple and easy to do. However, studies have shown that if you do your(1)_________outdoors in the hot and sunny weather, your body can overheat and lose a lot of fluid. This can lead to heat stroke. You should drink a glass of water before a workout and then pase regularly to drink more. You should also exercise early in the(2)________when it’s not too hot. Next is simming. It’s very important to be safe in the water. Swimming pools may look safe, but you should always(3)________the pool water before jumping in. Cold water can make your blood pressure and heart rate go(4)_______. Make sure you have warmed up your boby by stretching or jumping. Don’t swim in bad weather, especially in the rivers, lakes or the sea. If you are swimming and lightning strikes, you risk serious(5)_______or death.

Now, how about yoga? This exercise may look easy and suitable for people of all(6)_____. However, if it’s not done properly, it can do more(7)_______than good. You need to do some warm-up exercise such as stretching before you start your yoga practice. This will relax your(8)____and prevent any dammage to your joints.__________ The last type of physical activity is fitness(9)_______. First, you need good(10)______to keep you comfortable and pain-free. Next, when yo walk, don’t look at your feet. This will slow you down and cause back pain. Finally, remember to bring water with you and drink at least 150ml for every 15 minutes of walking. That’s all from me for today. Hope you find these safety precautions useful. Thanks for listening.

Question 3:

Tìm x

1 3 ×   x = 1 6 x - 1 5 = 3 10

Thả một thỏi sắt có  m 1 = 2kg ở nhiệt độ 140 0 C vào một xô nước chứa m 2 = 4,5kg nước. Sau khi cân bằng nhiệt độ cuối cùng là 27 0 C. Bỏ qua sự tỏa nhiệt ra môi trường. Biết nhiệt dung riêng của sắt, nước lần lượt là 460J/kg.K, 4200J/kg.K. ANhiệt độ ban đầu của nước là:

A.  21 , 5 0 C

B.  17 0 C

C.  27 0 C

D.  37 0 C

Cơ quan hô hấp của lưỡng cư là?

A. Mang.

B. Da.

C. Phổi.

D. Da và phổi

Phương trình ( x + 1 ) 4 - 5 ( x + 1 ) 2 - 84 = 0 có tổng các nghiệm là:

A.  - 12

B. -2

C. -1

D.  2 12