Nhân đa thức X với đơn thức Y biết rằng:

X   =   1 9 x 3 y   +   - 1 3 x 2   + 3 y 3   và   Y   =   ( 3 xy 2 ) 2 .

Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35.

Early writing and Alphabets

     When people first began to write, they did not use an alphabet. Instead, they drew small pictures to (31) _______ the objects they were writing about. This was very slow because there was a different picture for every word.

     The Ancient Egyptians had a (32) _______of picture writing that was called hieroglyphics. The meaning of this writing was forgotten for a very long time but in 1799 some scientists (33) _______ a stone near Alexandria, in Egypt. The stone had been there for over a thousand years. It had both Greek and hieroglyphics on it and researchers were finally able to understand what the hieroglyphics meant.

     An alphabet is quite different from picture writing. It (34) _______of letters or symbols that represent a sound and each sound is just part of one word. The Phoenicians, who lived about 3,000 years ago, developed the modern alphabets. It was later improved by the Roman's and this alphabet is now used (35) _______ throughout the world.

Điền vào ô số 31

A. notice    

B. show 

C. appear

D. mark 

“Your kitchen is fantastic! Did you do it all by yourself?” – “No, I ______ by a professional.”

A. had it designed

B. have it to be designed 

C. had designed it

D. designed it

I have lived near the airport for so long now that I’ve grown ________ to the noise of the airplanes.

A. accustomed

B. unconscious

C. familiar

D. aware

Cho hình chóp tam giác S. ABC có SA vuông góc với mặt phẳng (ABC), AB=6, BC=8, AC=10. Tính khoảng cách d giữa hai đường thẳng SA và BC.

A. Không tính được d

B. d=8

C. d=6

D. d=1