Chọn câu trả lời đúng:

1. The scientific.....improved her capacity of working in the laboratory significantly

A. course B. reference C. training D. book

2. Nowadays, email is the best means.....communication

A. of B. on C. in D. at

3. The result of our exam will be....on the website of our school next week

A. announced B. removed C. taken D. got

4......did Paul study medicine at university? For 7 years

A. when B. what year C. how long D. how

5. In my childhood, we.....much TV inside the house in hot weather

A. aren't watch B. don't watch C. won't watch D. didn't watch

6....girl in the class won the schoolarship?

A. what B. who C. whom D. which

7. The little girl started to cry. She....her doll and no one was able to find it for her

A. has lost B. had lost C. was losing D. loses

Chọn câu trả lời đúng:

1. The appearance of the girl.....the quarrel of the two boys

A. interrupted B. intervened C. cut D. released

2. After some experience, Paul became....and more responsible with his actions

A. insensitive B. mature C. careless D. adult

3. I got some valuable experience of teaching when I worked as a....last summer

A. tutor B. student C. trainee D. examiner

4. During dinner, the family members talked....their day

A. about B. over C. to D. with

chọn câu trả lời đúng:

1. It is good to do something in your....time

A. rest B. spare C. play D. home

2. You'll probably see Peter on the 6.30 bus; he....catches it to school

A. never B. rarely C. sometimes D. ususlly

3. This new kind of medicine can.....the pain of cancer patients more effectively

A. cut down B. shorten C. release D. ease

4. I forgot to enclose the.....vitae with my application form

A. curiculum B. resume C. background D. summary

5. Remember....the letter for me when you walk past the post office on your way to work today

A. post B. to post C. posting D. posted

6. I....her during the last summer

A. did not see B. haven't seen C. hadn't seen D. do not see

7. She....her friends for the last few days

A. didn't see B. hasn't see C. hadn't see D. doesn't see

8......were the games like? They were very exciting

A. how B. what C. which D. when

9......have you known your best friend Nam? I've known him for two years

A. how many B. how much C. how long D. how far

Sửa lỗi sai:

1. In the afternoon, we (go) to the fied again (and) work (for four hours) (before) we finish work at 6p.m

2. In spite of (her difficult) living conditions, Marie Curie (worked hard) and (earned) a degree (in Physics) with flying colors

3. (Although) it was late, she (returned home) because she (suddenly remembered) she (did not turn off) the gas cooker

Viết lại câu sử dụng mệnh đề quan hệ

1. A man answer the phone. He told me you were away

2. They volunteer to help the victims. Their houses were destroyed by a flood

3. Joan was planning to go to the conference. Her colleagues were waiting for him there

4. A waitress served us. She was very impolite and impatient

5. He has written a lot of emails. He has contacted his friends all over the world via emails

6. I met Alice's father. He worked at the university

7. A girl was injured in the accident. She is now in hospital

8. The film The Dark terrified her a lot. She watched it last night

9. A building was destroyed in the fire. It has now been rebuilt

10. John Bridge is one of my oldest friends. He has just gone to live in Canada

11. Don't use this product. It is not suitable to your hair

12. The birds have flown away. I found their nest in the tree behind my house

13. Some people were arrested. They have now been release

14. He is curious about the reason. She has been sa in recent day for that reasson

Nguyên tố T thuộc nhóm A trong bảng tuần hoàn. Tỉ lệ khối lượng phân tử giữa hợp chất khí với hiđro của nguyên tố R với oxit cao nhất của nó là 17:40. Tính % khối lượng của R trong oxit cao nhất

Hợp chất A có công thức MX₂ trong đó M chiếm 46,67% về khối lượng. Trong hạt nhân M có số nơtron nhều hơn số hạt proton là 4 hạt. Trong hạt nhân X, số nơtron bằng số proton. Tổng số proton trong MX₂ là 58 hạt. Tìm công thức của MX₂

Cho dạng đúng động từ trong ngoặc:

1. The life is all right if you have a job but things are not easy for the.....(employ)

2. If you like......., you can relax by playing computer games, listening to computer-played music (entertain)

3. It's not good to avoid....the teacher's question in class (answer)

4. My friend likes being taken photograph because she is very..... (photo)

Viết lại câu sao cho nghĩa không đổi:

1. No one has used this computer for a long time

This computer.................

2. The clock was made in China. My mother gave it to me on my bỉthday

The clock which.................

3. I haven't seen my uncle for ten years

I last.................

4. Last year, the Browns often bought groceries in this shop but now they don't

The Browns.................

5. The taxi driver is friendly. He took me to the airport

The taxi driver who.....................

Phân tử mARN thứ nhất có chiều dài 4610,4A⁰. Phân tử mARN thứ hai có chiều dài 3080,4A⁰. Các phân tử protein sinh ra từ mARN thứ nhất chưa tất cả 2245 liên kết peptit, các phân tử protein sinh ra từ mARN thứ hai chứa tất cả là 1794 liên kết peptit

a) Tính số a của mỗi phân tử protein được sinh ra từ mỗi mARN nói trên

b) Tính số phân tử protein tạo thành từ mỗi mARN

Một phân tử prôtêin hoàn chỉnh có khối lượng phân tử 33000đvc được tổng hợp từ một gen có cấu trúc xoắn kép của sinh vật trước nhân. Hãy tính:

a) Số liên kết peptit được hình thành khi tổng hợp protein trên? Biết rằng khối lượng phân tử của axit amin là 110 đvc

b) Chiều dài bậc một của protein hoàn chỉnh? Biết rằng kích thước trung bình của một axit amin là 3A⁰

c) Chiều dài của gen cấu trúc