B. To introduce volcano surfing and land diving.

B. 介绍火山冲浪和陆潜。

The original activity, called land diving, is part of a religious ceremony.

最初的活动被称为陆地潜水，是宗教仪式的一部分。

C. To talk about the dangers of volcano surfing and land diving.

C. 谈论火山冲浪和陆潜的危险。

D. It is famous for volcano surfing and land diving.

D. 它以火山冲浪和陆潜而闻名。

40. How are volcano surfing and land diving similar?

40. 火山冲浪和陆潜有什么相似之处？

Vanuatu's islands also offer visitors two of the most exciting and dangerous activities in the world: volcano surfing and land diving.

火山冲浪和陆潜。