Một cột đèn có bóng trên mặt đất dài 7,5m. Các tia nắng mặt trời tạo với mặt đất một góc xấp xỉ bằng 42 0 . Tính chiều cao của cột đèn. (làm tròn đến chữ số thập phân thứ ba)

A. 6,753m

B. 6,75m

C. 6,751m

D. 6,755m

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.

Volunteering is generally considered an (16) ______ activity and is intended to promote goodness or improve human quality of life. In return, it produces a feeling of self-worth and respect, rather than money. To volunteer simply means to be motivated and give your time or energy to work forwards an undertaking or cause you are interested in. Volunteering (17)______ individuals the chance to explore avenues that would not usually be open to them. This experience enables an exchange of culture and social contact between volunteers and those who benefit. When children volunteer, they often find themselves in a position where responsibility is required. They gain (18)______ when they know they’ve made a real contribution to a project. Research shows those who volunteer just one hour a week are 50 percent less likely to abuse drugs or alcohol, smoke cigarettes or engage in destructive behaviour. (19)______ my humble opinion, voluntary work needs to be integrated into the school curriculum.We need to motivate young people and make sure we create a culture or social activism where we insist that people help their community to empower others, (20)______ themselves.

Điên ô số 19

A. On

B. By

C. For

D. In

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.

She raised her hand high so that she could attract the teacher’s attention

A. Because her teacher attracted her, she raised her hand again

B. Though she raised her hand high, she couldn’t attract her teacher’s attention

C. To attract her teacher’s attention, she raised her hand high

D. She had such a high raising of hand that she failed to attract her teacher’s attention

Đốt cháy 2,15 gam hỗn hợp gồm Zn, Al và Mg trong khí oxi dư, thu được 3,43 gam hỗn hợp X. Toàn bộ X phản ứng vừa đủ với V ml dung dịch HCl 0,5M. Biết các phản ứng xảy ra hoàn toàn. Giá trị của V là

A. 240.

B. 480.

C. 160.

D. 320.

Tính giá trị biểu thức  K = log a a a  với  0 < a ≠ 1

A. K = 4 3  

B. K = 3 8

C.  K = 4 3  

D.  K = 1  

AH=12 cm

\(\frac{3}{4}\div x=1,2\)

\(x=\frac{3}{4}\div1,2=0,625\)

1 l i k e nha!

1D; 2D; 3B; 4B;5A

Lượng thóc trong kho sau lần bán thứ nhất là:

               40 : (1 - 1/3) = 60 (tạ)

Lúc đầu lượng thóc trong kho là:

               60 : (1 - 1/3) = 90 (tạ)

                         Đáp số: 90 tạ thóc