Jane’s brother doesn’t work as a worker and she doesn’t _______.

A. neither  

B. so   

C. too 

D. either

Up to now_________,space  exploring still remains_________very  risky, complex, and expensive endeavor.

A. X / a                

B. the / the            

C. a / X                 

D. a / the

Tiến hành các thí nghiệm sau:

(a) Sục khí Cl₂ vào dung dịch NaOH ở nhiệt độ thường.

(b) Hấp thụ hết 2 mol CO₂ vào dung dịch chứa 3 mol NaOH.

(c) Cho KMnO₄ vào dung dịch HCl đặc, dư.

(d) Cho hỗn hợp Fe₂O₃ và Cu (tỉ lệ mol tương ứng 2 : 1) vào dung dịch HCl dư.

(e) Cho CuO vào dung dịch HNO₃.

(f) Cho KHS vào dung dịch NaOH vừa đủ.

Số thí nghiệm thu được hai muối là

A. 4

B. 6

C. 3

D. 5.

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

The first question we might ask is: What can you learn in college that will help you in being an employee? The school teach a (46)________many things of value to the future accountant, doctor or electrician. Do they also teach anything of value to the future employee? Yes, they teach the one thing that it is perhaps most valuable for the future employee to know. But very few students bother (47)________it. This basic is the skill ability to organize and express ideas in writing and in speaking. This means that your success as an employee will depend on your ability to communicate with people and to (48)________your own thoughts and ideas to them so they will (49)________understand what you are driving at and be persuaded.

        Of course, skill in expression is not enough (50)________itself. You must have something to say in the first place. The effectiveness of your job depends on your ability to make other people understand your work as they do on the quality of the work itself. 

Điền vào số (46)

A. large      

B. great  

C. far     

D. lost

Công thức tổng quát của este thuần chức tạo bởi ancol no hai chức và axit không no có một nối đôi đơn chức là

A. C_nH_2n–2O₄

B. C_nH_2n–6O₄

C. C_nH_2n–4O₄

D. C_nH_2n–8O₄