问题
选择题
为增加某些橡胶制品的强度，加工时需进行硫化处理（即将橡胶原料与硫磺在一定条件下反应)；橡胶制品硫化程度越高，强度越大，弹性越差。下列橡胶制品中，加工时硫化程度较高的是[ ]
A．橡皮筋
B．汽车外胎
C．普通气球
D．医用乳胶手套
答案
答案：B
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为增加某些橡胶制品的强度，加工时需进行硫化处理（即将橡胶原料与硫磺在一定条件下反应)；橡胶制品硫化程度越高，强度越大，弹性越差。下列橡胶制品中，加工时硫化程度较高的是[ ]
A．橡皮筋
B．汽车外胎
C．普通气球
D．医用乳胶手套
答案：B
Many people think the more time is spent, the __1___work will be done, so students have to spend the whole __2_doing school work except the three meals .It is __3__to see students struggling (奋斗) in a sea of school work both at school and ___4___.Modern students usually have a lot of ___5___.They love music and sports .They like reading books and watching TV. A 6 weekend can get them away from too much school work and they can do __7__they like .But teachers don’t think so. 8 students have too much schoolwork and they have_9_ time to enjoy themselves. Students are really tired of their weekend homework, so they usually don’t do their weekend homework __10__Sunday night. But there is not enough time for much work, students have to finish it __11__.The weekend homework often makes teachers angry. Things always get __12__without right ideas, too much school work makes students _13_ interests in learning, and it’s also bad for their health. A horse runs faster after a _14_. But for students only rest is not enough .So such a condition should be _15__ to give students both pleasure and knowledge .Please give students less homework and leave them more free time .
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