Vẽ và viết tên đoạn thẳng vào bảng (theo mẫu):

Read the passage, and choose the correct answer A, B, C or D for each question.

If parents bring up a child with the sole aim of turning the child into a genius, they will cause a disaster. According to several scientists, this is one of the biggest mistakes which ambitious parents make. Generally, the child will be only too aware of what his parents expect, and will fail. Unrealistic parental expectations can cause great damage to children.

However, if parents are not too unrealistic about what they expect their children to do, but are ambitious in a sensible way, the child may succeed in doing very well - especially if the parents are very supportive of their child.

Michael is very lucky. He is crazy about music, and his parents help him a lot by taking him to concerts and arranging private piano and violin lessons for him. They even drive him 50 kilometers twice a week for violin lessons. Michael's mother knows very little about music, but his father plays the trumpet in a large orchestra. However, he never makes Michael enter music competitions if he is unwilling.

Winston, Michael's friend, however, is not so lucky. Both his parents are successful musicians, and they set too high a standard for Winston. They want their son to be as successful as they are and so they enter him for every piano competition held. They are very unhappy when he does not win. Winston is always afraid that he will disappoint his parents and now he always seems quiet and unhappy.

One of the serious mistakes parents can make is to …………

A. push their child into trying too much   

B. help their child to become a genius

C. make their child become a musician

D. neglect their child's education

câu 2: phần trăm của đồng vị thứ 2 = 100% - 80%=20%. Gọi x là đồng vị thứ 2

AMg = 24*80+x*20/100

24,2=24*80+x*20/100

suy ra 2420=1920+20x

vậy x=25

Để hoàn thành nhiệm vụ chung, vai trò của miền Bắc là gì?

A. miền Bắc là hậu phương, có vai trò quyết định trực tiếp. 

B. miền Bắc là hậu phương, có vai trò quyết định nhất.

C. miền Bắc là hậu phương, có nhiệm vụ chi viện cho cách mạng miền Nam.

D. miền Bắc là hậu phương, có nhiệm vụ bảo vệ cách mạng miền Nam.