如图，点B在线段AC上，AB=10cm，BC=4cm，点O是AC中点，则OA=______cm．-数学

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• Knowing office rules -- whether ______ or not -- is important, especially for young job seekers.A．wr
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• 如图，线段AB的长为8厘米，C为线段AB上任意一点，若M为线段AC的中点，N为线段CB的中点，则线段MN的长是______．-数学
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• Nowhere else in the world ________ to find this kind of fish except Brazil.A．went heB．he wentC．did h
• Every year a great number of foreign tourists pay a visit to _____ we Chinese call Heaven Lake.A．whe
• When _____ help, one often says “Thank you.” or “it’s kind of you”A．offeringB．to offerC．to be offere
• 如图，延长AB到C，使BC=3AB，M、N是BC上两点，且BM：MN=2：3，MN：NC=2：5，AC=100cm，求AB、BM、MN、NC的长．-数学
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• Not until World War II ______ to use new chemical techniques to purify penicillin.A．they managedB．th
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• –What do you think of Nanchang?－Nowhere else _____ such beautiful scenery.A．could one findB．one coul
• 过两点最多可以画1条直线(1=1×22)；过三点最多可以画3条直线(3=2×32)；过四点最多可以画______条直线；…；过同一平面上的n个点最多可以画______条直线．-数学
• I don’t think she’ll be upset, but I’II see her in case______________.A．she willB．she isC．she doesD．
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• 线段a的长是线段b的长的2倍，若a+b=12，则b的相反数是（）A．4B．8C．-4D．-8-数学
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• 直线AB、线段CD、射线EF能相交的是（）A．B．C．D．-数学
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