Một nguồn sáng nhỏ S đặt trước gương cầu lõm ở một vị trí thích hợp, có thể cho một chùm tia phản xạ song song.

Cảm ơn thầy đã quan tâm đến vụ việc này . Mặc dù không biết nó bắt nguồn từ đầu nhưng mong thầy hãy cố gắng xóa hết những tin nhắn kích động này . Em cũng là một nạn nhân !

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 following questions from 30 to 34.

In Science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion.

A useful theory, in addition to explaining past observation, helps to predict events that have not as yet been observed. After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientists’ predictions, the theory is supported. If observations do not confirm the predictions, the scientists must search further. There may be a fault in the experiment, or the theory may have to be revised or rejected.

Science involves imagination and Creative thinking as well as collecting information and performing experiments. Facts by themselves are not Science. As the mathematician Jules Henri Poincare said: “Science is built with facts just as a house is built with bricks. But a collection of facts cannot be called Science any more than a pile of bricks can be called a house.”

Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible Solutions to the problem are formulated. These possible Solutions are called hypotheses. In a way, any hypothesis is a leap into the unknown. It extends the scientist’s thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. For without hypotheses, further investigation lacks purpose and direction. When hypotheses are confirmed, they are incorporated into theories.

The word “this” in paragraph 1 refers to ___________.

A. the kinetic molecular theory

B. a good example 

C. an observed event

D. an imaginary model

1 : The bookstore is to the left of his house

\(\rightarrow\) His house is to the right of the bookstore

2 : The building is tall

\(\rightarrow\) It's tall

3 . Tom drives to work every morning

\(\rightarrow\) Tom travels to work every morning

4 : How much meat do you want ?

\(\rightarrow\) How much meat would you like?

5 : This book has twenty packets of tea

\(\rightarrow\) There are twenty packets of tea on this book

Bạn ơi sách Lưu Hoàng Trí mới hả ?

đề đâu ?

hay là chọn từ khác nghĩa

Hình như đây là sách Lưu Hoàng Trí ( mới ) đúng không ? Mặc dù không biết nhưng thôi làm đại vậy

Trang 133

V ) 1 ) Because he missed his flight in Washington .

2 ) The weather like cold

3 ) They have breakfast in the little Italian place next to the hotel .

4 ) Tom have coffee for his breakfast

5 ) He thinks New York is wonderful - really !

VI ) Match each text to the correct postcard ( Nối các văn bản để phù hợp để đúng với những tấm bưu thiếp )

A . Come to Scotland ( Đoạn 2 )

B . A trip to Lodon ( Đoạn 3 )

C . Normandy , France ( Đoạn 1 )

Trang 134

VI . 1 ) Jenny goes to go sightseeing on Friday

2 ) In Edinburgh , Brad Pitt going to make a horror film here .

3 ) Because Tom never believe his

4 ) This is Lisa

5 ) They going to see a play by Skakespeare

6 ) They are writing to their sir

VII ) 1 ) This is Hyde Park

2 ) This is Stamford Bridge

3 ) This is Madame Tussauds

4 ) This is Tate Modern

5 ) This is Wimbledon in June

6 ) This is The West End

7 ) This is Oxford street or visit one of the lively street markets

8 ) There are : The Tower of London ; St Paul's Cathedral ; London Eye

Trang 135 :

Writing :

I ) 1 ) Đoạn 1 : They are in Mallorca

Đoạn 2 : They are in Scotland

2 ) Đoạn 1 : They think it is lovely

Đoạn 2 : They think the place is great

3 ) Đoạn 1 : The weather like is fantastic

Đoạn 2 : It's not very good

4 ) Đoạn 1 : They staying in a small village

Đoạn 2 : They staying in a youth hotel

5 ) Đoạn 1 : They go swimming every morning and Kate goes sailing in the afternoon

Đoạn 2 : They go walking in the mountains every day

II ) Tự làm nhé

Ta có : \(B=\dfrac{1}{12}>\dfrac{1}{22};\dfrac{1}{13}>\dfrac{1}{22};....;\dfrac{1}{21}>\dfrac{1}{22}\)

Vậy : \(B=\dfrac{1}{12}+\dfrac{1}{13}+...+\dfrac{1}{22}>\dfrac{1}{22}+\dfrac{1}{22}+\dfrac{1}{22}+...+\dfrac{1}{22}=\dfrac{11}{22}=\dfrac{1}{2}\)

( Có 11 số hạng \(\dfrac{1}{2}\))

Hay B \(>\dfrac{1}{2}\)

\(\dfrac{4}{7}+\dfrac{5}{9}:x=\dfrac{1}{5}\)

\(\Rightarrow\dfrac{5}{9}:x=\dfrac{1}{5}-\dfrac{4}{7}=\dfrac{7-20}{35}=\dfrac{-13}{35}\)

\(\Rightarrow\dfrac{5}{9}:x=\dfrac{-13}{35}\Rightarrow x=\dfrac{5}{9}:\dfrac{-13}{35}=\dfrac{5}{9}.\dfrac{35}{-13}=\dfrac{175}{-117}\)

\(\Rightarrow x=\dfrac{175}{-117}\)