题目

贝多芬耳聋后仍利用牙咬住木棒的一端，另一端顶在钢琴上来听自己演奏的琴声，这种声音的传导方式叫骨传导，说明_____可以传声。（填“固体”、“液体”或“气体”）在月球上的宇航员面对面的交谈也要借助无线电通讯设备，这是因为真空_____传声。 答案：【答案】固体不能【解析】琴弦的振动引起木棒的振动，然后传给头骨，最后传给听觉神经，引起听觉；说明声音的传播是通过固体传过来的，说明了固体可以传声。在月球上的宇航员面对面的交谈也要借助无线电通讯设备，这是因为声音的传播需要介质，真空不能传声。 　　He has been called the“missing link”,Half-man,halfbeast．He is supposed to live in the highest mountain in the world— Mount Everest． 　　He is known as the Abominable Snowman．The 　　1　　 of the Snowman has been around for 　　2　　．Climbers in the 1920．s reported finding marks like those of human feet highup on the side of Mount Everest．The native people said they 　　3　　 this creature and called it the“Yeti”,and they said that they had 　　4　　 caught Yetis on two occasions 　　5　　 none has ever been produced as evidence（证据）． 　　Over the years,the story of the Yetis has 　　6　　．In 1951,Eric Shipton took photograph of a set of tracks in the snow of Everest．Shipton believed that they were not 　　7　　 the tracks of a monkey or bear and 　　8　　 that the Abominable Snowman might really 　　9　　． 　　Further efforts have been made to find out about Yetis．But the only things people have ever found were 　　10　　 footprints．Most believe the footprints are nothing more than 　　11　　 animal tracks,which had been made 　　12　　 as they melted（融化）and refrozen in the snow．　　13　　,in 1964,a Russian scientist said that the Abominable Snowman was 　　14　　 and was a remaining link with the prehistoric humans．But,　　15　　,no evidence has ever 　　16　　 been produced． 　　These days,only a few people continue to take the story of the Abominable Snowman 　　17　　．But if they ever 　　18　　 catching one,they may face a real 　　19　　:would they put it in a 　　20　　．or give it a room in a hotel? (1) [　　] A． event B． story C． adventure D． description (2) [　　] A． centuries B． too long C． some time D． many years (3) [　　] A． heard from B． cared for C． knew of D． read about (4) [　　] A． even B． hardly C． certainly D． probably (5) [　　] A． as B． though C． when D． until (6) [　　] A． developed B． changed C． occurred D． continued (7) [　　] A． entirely B． naturally C． clearly D． simply (8) [　　] A． found B． declared C． felt D． doubted (9) [　　] A． exist B． escape C． disappear D． return (10) [　　] A． clearer B． more C． possible D． rare (11) [　　] A． huge B． recent C． ordinary D． frightening (12) [　　] A． strange B． large C． deep D． rough (13) [　　] A． In the end B． Therefore C． After all D． However (14) [　　] A． imagined B． real C． special D． familiar (15) [　　] A． so B． besides C． again D． instead (16) [　　] A． rightly B． actually C． normally D． particularly (17) [　　] A． lightly B． jokingly C． seriously D． properly (18) [　　] A． succeed in B． insist on C． depend in D． join in (19) [　　] A． decision B． situation C． subject D． problem (20) [　　] A． zoo B． mountain C． museum D． laboratory