What'snewinthescientificcommunity?Herearefourgadgets(小玩意儿)toopenupyoureyes：MosquitoRepellingNecklaceForquitealotofpeoplemosquitoesareoneofthebig

　　What'snewinthescientificcommunity?Herearefourgadgets(小玩意儿)toopenupyoureyes：

　　MosquitoRepellingNecklace

　　Forquitealotofpeoplemosquitoesareoneofthebiggestproblemsbroughtbythewarmandoftenrainyseason．Thenecklacegeneratesasonic(声波的)repellingfrequency(频率)whichkeepstheinsectsaway．Unlikemanyotherproductsitdoesn'tuseanykindofchemicalsandtoxicspraysthatposesapotentialthreatforthehumanbody．Theplasticcaseiscompact(简洁的)enoughtoweararoundyourneckorcliptoyourcollar．Effectiveuptothreemetersinradius(半径)．

　　IceCreamBall

　　Icecreaminjust20minutes?Nomagictricks．

　　Allthey'llneedarefiveingredientsandsomerollingaround．Loadiceandrocksaltintooneendandtheicecreamingredientsintotheother．Asthemixtureoficeandrocksaltismeltingitabsorbsheat．

　　Rollortosstheballaroundandvoila-icecream．

　　Cellphone

　　Thisnewkindofcellphonefeaturesacolortouch-screen－speechballoons(对话框)arebroughttoreallifefromcomic(漫画的)strips．Itadaptstoyourfavoritecomics:talkstoyouinyourfavoritecharacter'slanguageupdatesyouonnewringingtonesandgamesbasedonthecomics．ThetailofthecellphoneservesasaUSBconnectortointerchangedatabetweenthisphoneandacomputer．Turnthiscellphone90degrees－thecontentsofthescreenwillrotate(旋转)aswell．EvenifyouhangupsidedownlikeSpidermanyouwillmakeeverythingout．

　　Time-flex

　　Wanttokeeptrackoftimebuthatewearingbulkywatches?CheckoutTime-flexthisultra-flexibleself-gummingwatchstickstoyourskinorclotheslikeatransparentBand-Aid．Itcanbepeeledoffandrolleduplikepaperwhennotinuse．Youcontrolthemenuviatouch-screen．It'spoweredbyultrasmallbatteriesthatareinvisibletothenakedeye．

　　(1)

　　AccordingtothepassagewhichdescriptionaboutthemosquitorepellingnecklaceisTrue?