The speed of light is faster than the speed of sound by a significant margin, since sound travels at about 343 meters per second while light travels a...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your ...
解析 【解析】【答案】把What改为That 【解析】此句的句意是“光的传播速度比声音快是 常识”;分析句子成分和结构可知,主语从句light travels faster than sound不缺句子成分且意思完 整,所以直接用That来引导主语从句。故此处答 案是把What改为That.
"The teacher told the students"后接的从句 "light travels much faster than sound" 是完整的陈述句,不需要充当主语或宾语的成分,也没有疑问、条件或时间的含义,因此需要用纯连接词 "that" 引导宾语从句。**逐项分析:**- **A. what**:引导名词性从句时用于缺少主语/宾语的情况,但从句结构完整,排除;- *...
7. Honesty is a very expensive gift. Don't expect it from cheap people. 诚实是一种非常高贵的品质,不要期望能从廉价的人身上得到。 8. Don't let anyone ever make you feel like you don't deserve what you wa...
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While it doesn't emit, absorb, or reflect light, we know dark matter exists because of the way its gravity affects visible matter. Galaxies rotate faster than they should based on the mass we can see, and large-scale structures in the universe form in patterns that only make sense if the...
解析 A。本题考查主语从句。“It is known to all that”是固定句型,其中“that light travels faster than sound”是主语从句,that 在主语从句中不做成分,只起连接作用,if 不能引导主语从句,what 在主语从句中充当主语、宾语等成分,when 在主语从句中作时间状语,此处用 that 引导主语从句。
试题来源: 解析 A。解析:本题考查主语从句的引导词。it 作形式主语,真正的主语是后面的从句,从句中不缺少任何成分,所以用 that 引导。what 在主语从句中充当主语、宾语或表语;which 在主语从句中有选择的意思;when 在主语从句中作时间状语。反馈 收藏
He hasn't decided whether to go by bus or by train.他还未决定是乘公共汽车去还是坐火车去。 ④whether置于句首时,不能换用if。如: Whether this is true or not,I can't say.这是否真的我说不上来。 ⑤引导主语从句和表语从句时宜用whether。如: Whether she will come or not is still a ...
Light is electromagnetic radiation that allows us to see, moving at approximately 299,792 km/s in a vacuum. Sound is a mechanical wave that travels through a medium like air or water, typically moving at about 343 m/s in air.