【題目】There is no doubt _______ scientific knowledge is very important for teenagers.
A.whether
B.that
C.if
D.what

【答案】B
【解析】句意：毫無(wú)疑問(wèn)，科學(xué)知識(shí)對(duì)于青少年來(lái)說(shuō)很重要。whether是否；that引導(dǎo)賓語(yǔ)從句無(wú)意義，只起連接作用；if是否；what什么。句型：There is no doubt that……毫無(wú)疑問(wèn)……。所以答案是B。

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