The scientist wants to tell people ________.

[　　]

A．how important is it to protect our environment

B．how important it is to protect our environment

C．how important to protect our environment

D．how important is to protect our environment

答案：B
解析：

考查賓語(yǔ)從句的語(yǔ)序及it作形式主語(yǔ)，不定式作真實(shí)主語(yǔ)。由句意“科學(xué)家們想要告訴人們保護(hù)環(huán)境有多么重要”�？芍�B項(xiàng)正確。


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