Question

The scientist wants to tell people ________.

1. A.
   how important is it to protect our environment
2. B.
   how important it is to protect our environment
3. C.
   how important to protect our environment
4. D.
   how important is to protect our environment

Answer 1

B
考查宾语从句的语序及it作形式主语，不定式作真实主语。由句意“科学家们想要告诉人们保护环境有多么重要”。可知B项正确。