[对点训练]①(2013•天津中考)HepromisedhisoldfriendduringhisstayinTianjin.A.seeB.seeingC.sawD.tosee②(2014•宜昌中考)一Smokingisreallybadforhealth.—Teenagersinourschoolhavetheyw
[对点训练]
① (2013 •天津中考) He promised his old friend during his stay in Tianjin.
A. see B. seeing C. saw D. to see
② (2014 •宜昌中考) 一Smoking is really bad for health.
—Teenagers in our school have they will refuse the first cigarette.
A. pronounced B. provided
C. promised D. produced
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设集合A={x/x²+4x=0,x∈R} B={x/x²+2(a+1)x+a²-1=0,a∈R,x 2020-04-05 …
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:设函数f(x)=-X(X-a)平方 (X?R),其 中a?R(1) 当a=1时,求曲线y=f(x 2020-06-27 …