1 . 选出划线部分为主语的句子

A．We often speak English in class.

B．Smoking does harm to the health.

C．To swim in the river is a great pleasure.

D．One-third of the students in this class are girls.

2 . It is natural to be critical of languages that lack expressions you consider essential. (用标准符号画出句子内部成分, 英译汉)

3 . An area of land held today by a given nation-state in the past likely belonged to a different political empire or kingdom. (用标准符号画出句子内部成分, 英译汉)

4 . Now, some countries claim that museums have a responsibility to return these antiquities to their original locations. (用标准符号画出句子内部成分, 英译汉)

5 . Their letters reminded me of how, by reaching out with just a song or a bit of friendship, you can turn a very tense situation into a peaceful experience. (用标准符号画出句子内部成分, 英译汉)

6 . The dolphin’s ability to please humans has made it one of our favorites in the animal kingdom. 请选出本句中的主语。

A．The dolphin’s ability to please humans	B．humans
C．one of our favorites	D．the animal kingdom