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【单选题】
不属于搜索引擎网址的有( )A.
http://www.baidu.com
B.
http://www.hongen.com
C.
http://www.google.com
D.
http://cn.yahoo.com
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举一反三
【多选题】Read the statements and choose the ones that you think Zachary Blaine probably agrees with. Discuss your answers with a partner.
A.
Farm kids would like to do the things that city kids do.
B.
Most city kids get into trouble with drugs and alcohol.
C.
Growing up with a lot of responsibility is good for kids.
D.
It’s good for kids to visit places like museums, libraries, and theaters.
E.
Most city kids would like to grow up on a farm.
F.
City children might not get into trouble with guns, alcohol, and drugs if they had animals to take care of.
【多选题】对于接触角的影响因素,以下说法正确的是
A.
对指定固体，液体表面张力越大，接触角越大。
B.
对指定液体，固体表面能越大，接触角越大。
C.
固体表面，特别是高能表面能自发地从周围环境中吸附某些组分而降低表面能，同时也改变了表面性质，从而影响接触角大小。
D.
温度、液滴形成时间等因素都可能对接触角产生影响。
【单选题】( )反映了机构各种文献入藏情况的数目数据库,通过它可以查询某一文献在该机构是否有收藏或索书号
A.
期刊数据库
B.
馆藏目录查询系统
C.
学位论文数据库
D.
二次文献数据库
【单选题】下列有关PM2.5的表述,不正确的一项是( )
A.
细颗粒物PM2.5是“环境空气中空气动力学当量直径小于或等于2.5微米的固体颗粒或液滴的总称”。
B.
PM2.5之所以能够在空气中被大气环流带到较远的地方，是因为它的体积小，重量轻，且能够在空气中滞留很长时间。
C.
由于比表面积较大，因此在PM2.5上可以吸附更多的有害物质。
D.
PM2.5主要是通过影响人们呼吸系统的正常运转，引发各种疾病，因此对人们的健康造成极大的危害。
【单选题】That summer an army of crickets started a war with my father. They picked a fight the minute they invaded our cellar. Dad didn't care for bugs much more than Mamma, but he could tolerate a few spiders...
A.
urban.
B.
rural.
C.
metropolitan.
D.
extravagant.
【单选题】If your farm had the only known source of a rare cocoa bean needed to make chocolate-covered peanuts, your monopoly would result from:
A.
control of a scarce resource or input.
B.
technological superiority.
C.
increasing returns to scale.
D.
government-set barriers.
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