Nếu nhiệt độ của một bóng đèn khi tắt là 25 o C , khí sáng là 323 o C , thì áp suất của khí trơ trong bóng đèn tăng lên là

A. 10,8 lần

B. 2 lần

C. 1,5 lần

D. 12,92 lần

Choose the letter A, B, C or D to answer these following questions

Bob is a student. This is his bedroom. He does his homework, play computer games and relax here. There is a desk, a chair, a wardrobe, a bed and a bookshelf in his room. The wardrobe is between the desk and the bed. There is a computer, ten books and five pens on his desk. There are some pictures of his family on the wall. He loves this room so much, so he cleans it regularly.

Question:How many pens are there in his desk?

A. 2

B. 3

C. 4

D. 5