之上;in在里面;through通过;at在一点;by通过某种方式,到……为止。句意:声音在空气中的传播速度大约是每秒340米。结合语境可知前文是通过空气的速度,下文表示在数字上的一点,故前一空用through,后一空用at,选B。 考点:介词辨析 点评:英语介词的一个特点是一词多义,并且介词间语义交叉现象很多,习惯用法也很多,...
over; inthrough; atby; atthrough; over 相关知识点: 试题来源: 解析 B over越过,在……之上;in在里面;through通过;at在一点;by通过某种方式,到……为止。句意:声音在空气中的传播速度大约是每秒340米。结合语境可知前文是通过空气的速度,下文表示在数字上的一点,故前一空用through,后一空用at,选B。考点...
1.原文:Thesearegas-like fluidswhoseatomshave been ionisedby losing some or all of their electrons—as happens to the air, by frictional heating,whenan object travelshypersonicallythroughthe atmosphere. 2.分析:主句的结构为主(These)系(are)表(gas-like fluids),whose引导定语从句,从句的结构是主(atom...
Sound travels ___ air ___ a speed of about 340 metres per second. A.over; inB.through; atC.by; atD.through; over 请仔细审题,看清楚题目要求,认真作答! 正确答案 验证码: 查看正确答案 试题解析 over越过,在……之上;in在里面;through通过;at在一点;by通过某种方式,到……为止。句意:声音在空...
1Sound travels ___ air ___ a speed of about 340 metres per second.A.over; inB.through; at C.by; atD.through; over 2 Sound travels ___ air ___ a speed of about 340 metres per second. A.over; in B.through; at C.by; at D.through; over 3【题文】Sound travels ___ ...
解析 分析 声音在空气中的传播速度是大约每秒340米. 解答 答案:travels.声音在空气中的传播,这是一个自然现象,所以要用一般现在时.根据主语是sound,结合英语提示travel,所以要用travels.故填travels. 点评 有些自然规律的事情,要用一般现在时,首先要确定时态,然后结合给出的英语提示,就可以确定答案....
Because given the difference in density between the air in the nasal cavity and the seawater, we'd expect those sounds to just kinda go bouncing around inside the dolphin's head! Which would do it no good at all?if it's going to navigate, it needs those sounds to be broadcast and ...
声音通过空气传播
Through leaks or weak spots in the wall or floor – flanking transmissionSound travels through the air outside and inside our homes, then it will hit a surface (wall / floor / door / window). What happens then? This is an important question because it helps us to understand how soundpro...
之上;in在里面;through通过;at在一点;by通过某种方式,到……为止。句意:声音在空气中的传播速度大约是每秒340米。结合语境可知前文是通过空气的速度,下文表示在数字上的一点,故前一空用through,后一空用at,选B。 考点:介词辨析 点评:英语介词的一个特点是一词多义,并且介词间语义交叉现象很多,习惯用法也很多,...