Chia m gam hỗn hợp E gồm các peptit mạch hở thành hai phần bằng nhau. Đốt cháy hoàn toàn phần một thu được N₂, CO₂ và 31,5 gam H₂O. Thủy phân hoàn toàn phần hai, thu được hỗn hợp X gồm glyxin, alanin, valin. Cho X vào 300ml dung dịch NaOH 2M, được dung dịch Y chứa 65,1 gam chất tan. Để tác dụng vừa đủ với Y cần dung dịch chứa 1,1 mol HCl. Biết các phản ứng hoàn toàn. Giá trị của m gần nhất với giá trị nào sau đây?

A. 86

B. 85

C. 88.

D. 87.

câu này mình cũng bó tay lun

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

  Many parents believe that they should begin to teach their children to read when they are slightly more than toddlers. This is fine if the child shows a real interest but forcing a child could be counter­productive if she isn't ready. Wise parents will have a (23) __________ attitude and take the lead from their child. What they should provide is a selection of (24) _________ toys, books and other activities. Nowadays there is plenty of good material available for young children, and of course, seeing plenty of books in use about the house will also encourage them to read.

  Of course, books are no longer the only source of stories and information. There is also a huge range

of videos, (25) __________ can reinforce and extend the pleasure a child finds in a book and are (26) _______ valuable in helping to increase vocabulary and concentration. Television gets a bad review as far as children are concerned, mainly because too many spend too much time watching programs not intended for their age group. Too many television programs induce an incurious, uncritical attitude that is going to make learning much more difficult. However, (27) ________ viewing of programs designed for young children can be useful. Just as adults enjoy reading a book after seeing it serialised on television, so children will pounce on books which feature their favourite television characters, and videos can add a new dimension to a story known from a book.

Điền vào số 24

A. bright

B. thrilling

C. energetic

D. stimulating