Cho tứ diện ABCD có các cạnh BA, BC, BD vuông góc

với nhau từng đôi một (như hình vẽ bên dưới). Khẳng định

nào sau đây sai?

A. Góc giữa AD và (ABC) là góc A D B ^

B. Góc giữa CD và (ABD) là góc  C B D ^

C. Góc giữa AC và (BCD) là góc A C B ^

D. Góc giữa AC và (ABD) là góc  C A B ^

Thủy phân 8,8 gam etyl axetat bằng 200 ml dung dịch NaOH 0,2 M. Sau khi phản ứng xảy ra hoàn toàn, cô cạn dung dịch, thu được m gam chất rắn khan. Giá trị của m là

A. 8,20.

B. 8,56.

C. 10,40.

D. 3,28.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrases that best fits each of the numbered blanks.

         Parents and teachers are always making (36) ________ between the time when they were children and the present generation . They say everything was better than it is today, especially in education. (37) ________ , they say they used to work much harder in school, and that nowadays, we aren’t very interested. I disagree, because we spend hours every day doing homework after our lessons or (38) ________ for exammination. I wonder (39) ________ our parents really had to study so much after school every day. In my opinion, it is no exaggeration to say we have forgotten how to play. I think one reason why kids (40) ________ in class is because they need to get rid of stress.

Điền vào số (37)

A. As a result       

B. Therefore         

C. For example     

D. Nevertheless

Mark the letter A,B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

He didn’t pay attention to what I said.

A. He took no notice of my words.

B. He didn’t hear me even though I was saying to him.

C. He had no intention to talk to me.

D. He took my advice.

Dãy nào sau đây gồm các polime dùng làm chất dẻo?

A. polietilen; Poli (vinyl clorua); Poli (metyl metacrylat)

B. nilon-6; xenlulozơ triaxetat; P o l i   ( p h e -   n o l - f o m a n d e h i t )

C. polibuta-l,3-đien; Poli (vinyl clorua); Poli (metyl metacrylat)

D. Poli stiren; nilon-6,6; polietilen

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. 

There are several means of mass communication. The newspaper is one. Television is ______.

A. another 

B. other

C. the another

D. the other

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. 

Minh : " My first English test was not as good as I expected "                        Thomas : " _________."

A.    Good Heavens!

B. Never mind , better job next time!

C. That's brilliant enough!

D. It's okay . Don't worry.