如图所示，有一辆汽车满载西瓜在水平路面上匀速前进。突然发生意外情况，紧急刹车做匀减速运动，加速度大小为a，则汽车中间一质量为m的西瓜A，受其它西瓜对它的作用力大小是
( ) —What is the fourth day of the week? —_____________ A. Friday B. Wednesday C. Saturday
( ) How many _____ does Bob have for his trip? A. day B. days C. dayes
( ) How can we go ________ ? A. there B. to there C. at there
( )Xi’an is _______ old city. A. A B. An C. the
比一比，找出不同类的单词。 （）（1）A. plane B. bus C. truck D. foot （）（2）A. cinema B. shop C. plane D. restaurant （）（3）A. fast B. quick C. arrive D. slow （）（4）A. leaf B. go C. come D. arrive （）（5）A. Sunday B. October C. May D. July
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