1 It takes me an hour to get to work

I get to work in an hour.

2 Nam plays for his school badminton team

Nam is a player of his school badminton team.

3 My brother was at home yesterday and i was ,too

Both my brother and I were at home yesterday.

4 Brushing your teeth every day is very important

It's very important to brush your teeth everday.

5 I perfer pop music to traditional music

I like pop music better than traditional music.

6 John plays tennis well

John is a good tennis player.

2 Mary didn't go to school yesterday because of her sickness

Because Mary was sick, she didn't go to school yesterday.

3This picture is more beautiful than that one

That picture is not as beautiful as this one.

4 You should not worry about the final exam

You'd not worry about the final exam.

5 It is not easy for me to make friends with foreign people

I have difficuly making friends with foreign people.

6 I couldn't come to Nam's birthday party because of the heavy rain

The heavy rain prevented me from coming to Nam's birthday party.

Hoan chinh cau

1 How many/hours/Hoa's brother/spend/homework/day?

=> How many hours does Hoa's brother spend on homework a day ?

2 i hope/i/become/famous/film star/future

=> I hope I will become a famous film star in the future.

3 Our teacher /and/we/happy/work/and/play/together

=> Our teacher and we are happy to work and play together.

4 Millions /people /play/watch/football/aroud/world

=> Millions of people play and watch football around the world.

5 It/usually/take/me/half/hour/get/school/bike

=> It usually takea me half an hour to get to school by bike.

1.This is our school.

--->This school is ours

2. We wil use renewable energy in the future.

---> Renewable energy will be used in the future.

3.I often walked to school when I was a student.

---> I used to walk to school when I was a student.

4. Although they are short, they still love playing sports.

--->In spite of being short, they still love playing sports.

5. They will use solar enegry to protect the environment.

---> Solar energy will be used to protecr the environment.

6.Although she eats lots of food, she is still very slim.

---> In spite of eating lots of food, she is still very slim.

a. Mary is as tall as her brother.

b. A lemon is not as sweet as an orange.

c. A donkey is not as big as a horse.

a. This dress is as pretty as that one.

e. The weather is not as cold as yesterday.

là: ( 99 - 12 ) : 3 + 1 = 30 (phần tử)

Thủy phân hoàn toàn 0,1 mol peptit A mạch hở(A được tạo ra bởi các amino axit có 1 nhóm amino và 1 nhóm cacboxyl) bằng một lượng NaOH gấp 3 lần lượng cần dùng. Cô cạn dung dịch sau phản ứng thu được hỗn hợp chất rắn tăng so với khối lượng của A là 58,2 gam. Số liên kết peptit của peptit A là

A. 14

B. 15

C. 4

D. 5

Tiến hành các thí nghiệm sau:

(1) Cho Na vào dung dịch CuSO₄ dư;

(2) Cho dung dịch HCl dư vào dung dịch NaAlO₂;

(3) Cho NaOH dư vào dung dịch AlCl₃;

(4) Sục khí CO₂ đến dư vào dung dịch NaAlO₂;

(5) Sục khí H₂S vào dung dịch FeCl₃;

(6) Sục khí NH₃ dư vào dung dịch Al₂(SO₄)₃.

Sau khi các phản ứng kết thúc, có bao nhiêu thí nghiệm thu được kết tủa?

A. 4

B. 5

C. 2

D. 3

Ta có : \(\left\{{}\begin{matrix}AB=AC\left(gt\right)\\DB=DC\left(gt\right)\end{matrix}\right.\)

\(\Rightarrow\) AD là đường trung trực của đoạn thẳng BC

\(\Rightarrow AD\perp BC\)