Crackinh hoàn toàn một thể tích ankan X thu được 5 thể tích hỗn hợp Y. Lấy 5,6 lít Y (đktc) làm mất màu vừa đủ dung dịch chứa a mol Br₂. Giá trị của a là

A. 0,2

B. 0,15

C. 0,25

D. 0,1

Choose the option among A, B, C, D whIch needs correcting to make a complete sentence
I didn’t feel like to go to church this moraing because it was raining hard

A. didn’t

B. to go

C. to church

D. raining hard

Trong phổi là các chùm phế nang ở người có tới 700-800 triệu phế nang , xung quanh còn cis hệ thống mao mạch dày đặc nơi xảy ra các quá trình trao đổi khí . Sự trao đổi khí ở phế nang ( ôxi từ phế nang vào máu , các bon nic từ máu vào phế nang ) chính là sự trao đổi khí ở phổi . Vì thế phế nang được coi là đơn vị chức năng của phổi

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 questions from 36 to 42.

          Martin Luther King, Jf, is well- known for his work in civil rights and for his many famous speeches, among which is his moving “I have a dream” speech. But fewer people know much about King’s childhooD. M.L., as he was called, was bom in 1929 in Atlanta, Georgia, at the home of his maternal grandfather. M.L.’s grandfather purchased their home on Auburn Avenue in 1909, twenty years before M.L was bom. His grandfather allowed the house to be used as a meeting place for a number of organizations dedicated to the education and social advancement of blacks. M.L. grew up in the atmosphere, with his home being used as a community gathering place, and was no doubt influenced by it.

M.L.’s childhood was not especially eventfully. His father was a minister and his mother was a musician. He was the second of three children, and he attended all black schools in a black neighborhood. The neighborhood was not poor, however. Auburn Avenue was an area of banks, insurance companies, builders, jewelers, tailors, doctors, lawyers, and other businesses and services. Even in the face of Atlanta’s segregation, the district thrived. Dr. King never forgot the community spirit he had known as a child, nor did he forget the racial prejudice that was a huge barrier keeping black Atlantans from mingling with whites.

M.L. was________by the atmosphere in which he grew up.

A. not affected at all

B. doubted

C. certainly influenced

D. prejudiced

Đảm bảo sự thích nghi với môi trường và điều kiện sống luôn thay đổi và sự hình thành các thói quen các tập quán tốt đối với con người

Một tế bào có kiểu gen AB ab Dd  khi giảm phân bình thường sẽ tạo ra mấy loại trứng?

A. 8

B. 2

C. 4

D. 1