【名词&注释】
性知识(sexual knowledge)、氢氧化钠(sodium hydroxide)、掷实心球、河姆渡、北京人(peking man)、元谋人
[单选题]小明在体育中考时见到了下列的一些现象，其中不能用惯性知识解释的是（ ）
A. 小华不小心在跑道上摔了一跤
B. 在起跑时，都用脚向后用力蹬地
C. 在投掷实心球时，球离开手后会继续向前运动
D. 参加50m×2往返跑测试的同学跑到终点后想立即停下来却办不到
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举一反三：
[单选题]（B）ArecentreportfromDazhouDailysaysabout18%ofDazhouteenagerscanhaveproblemswiththeirminds（内心，精神）.Somestudentsbecomeworriedbecausetheyhavetostudyveryhard.Othershavetroublegettingonwellwith
A. peopleliketheirparentsandclassmates.
B. ZhangQiang,aJunior2studentfromDazhou,couldnotunderstandhisteachersinclassandwasdoingbadlyinhis
C. lessons.Hewasafraidofexams.Whenhelookedattheexampaper,hecouldn’tthinkofanythingtowrite.
D. Anotherstudent,a15-year-oldgirlcalledWuYanfromGuang’anoftenarguedwithherclassmatesevenherparentsbecauseofsomedifferentideas.Shebecamesoannoyed
E. aboutthemthatshestartedtocutherfingerwithaknife.
F. However,manystudentswhohaveproblemswon’tgoforadviceorhelp.Somethinktheywilllookstupid（愚蠢的）iftheygotoseeadoctor.Othersdon’twanttotalkabouttheirsecrets.Inordertosolvetheteenagers’problems,hereissomeadvice:
G. ●Talktoyourparentsorteachersoften.
H. ●Takepartingroupactivitiesandplaysports.
I. ●Gotoseeadoctorifyoufeelunhappyorunwell.
J. 51.Itisreportedthat_______studentsinDazhoucanhaveproblemswiththeirminds.
K. most
L. many
M. some
N. allthe
[单选题]向pH为4的盐酸中加入下列物质，混合后溶液的pH可能会减小的是（ ）
A. 纯水
B. 氢氧化钠溶液
C. pH为4的盐酸
D. 硫酸溶液
[单选题]我国是世界上最早种植粟的国家之一，你知道最早种植粟的居民吗？请选出 （ ）
A. 元谋人
B. 北京人(peking man)
C. 半坡居民
D. 河姆渡居民
[单选题]55_______.
A. Insteadof
B. Lookforwardto
C. Payattentionto
D. Thanksto
[单选题]56．
A. first
B. second
C. third
D. fourth
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