A liên kết với T bằng

A. 2 liên kết cộng hoá trị

B. 3 liên kết cộng hoá trị

C. 2 liên kết hidro

D. 3 liên kết hidro

Read the following text and choose the best answer.

The word “them” refers to ______.

A. British cavers

B. stalagmites

C. kilometers

D. caverns

Read the passage and answer the questions

Once a poor famer had a daughter named Little Pea. After his wife died, the farmer married again. His new wife had a daughter, Stout Nut. Unfortunately, the new wife was very cruel to Little Pea because she wasn’t her daughter. Little Pea had to do chores all day. This made Little Pea father very upset. He soon died of a broken heart.

Summer came and went. As a tradition, in the fall, the village held its harvest festival. That year, everyone was very excited as the prince wanted to choose his wife from the village. Stout Nut's mother made new clothes for her, but poor Little Pea had none.

However, before the festival started, a fairy appeared and magically changed Little Pea's rags into beautiful clothes.

As Little Pea ran to the festival, she dropped one of her shoes and lost it. When the prince found the shoe, he decided to marry the girl who owned it. Of course, the shoe fitted Little Pea, the prince immediately fell in love with her.

Her stepmother didn’t love Little Pea because ________________.

A. Little Pea wasn’t the daughter whom she gave birth of.

B. the famer’s ex-wife died young.

C. the farmer wasn’t cruel to little Pea.

D. the farmer was going to die of a broken heart.