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问题 单项选择题

某公司计划3年以后购买1台200万元的机械设备，拟从银行存款中提取，银行存款年利率为4%，则现应存入银行的资金为( )万元。

A．176.00
B．177.56
C．177.80
D．224.97

答案

参考答案：C

问答题

　　九年级某班正在 举行“千古风流人物”的综合性学习活动。让我们一起触摸历史上的风流人物，与他们进行心灵的沟通吧！

【活动一：名著人物知是谁】根据下面的语言提示，写出相应的历史人物。

A、他励精图治，赏罚分明，善计谋，通兵法，深得将士爱戴，以草船借箭、赤壁之战 借的东风等流芳百世。

__________

B、他是三国时魏国真正的创业者，一代 * * 雄，同时他也是卓有成就的军事家、政治家、文学家，他的《观沧海》抒发了苛求统一天下的雄心壮志。

__________

【活动二：亲近今朝风流人物】今朝风流人物总让我们感动。总有一种力量震撼着我们的心灵，让我们走进他们。四年前，他是带着雅典失利的打击归来的，迎接他的不是鲜花和掌声，而是无数的质疑和指责。而在刚结束的08年奥运会上，27岁的杨威终于完成了对前辈李宁和李小双的超越，成为中国体操历史上最为耀眼的体操巨星。

面对他，你有何感言？

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单项选择题

In fall 2006, the National Basketball Association (NBA) started using basketballs made with synthetic, or man-made, material instead of leather. They made the change because they wanted every basketball they use to feel and bounce the same. Not all leather balls are exactly alike in weight or how they bounce, but the synthetic balls are.
However, some players complained right away that the new balls bounced differently and were actually harder to control than the leather ones.
Physics helped answer questions about why the new balls felt different. For example, the scientists studied friction, which in this case affects the ability of a player to hold onto a ball. "The greater the friction, the better it will stick to his hand," explains a scientist.
Tests on both wet and dry balls showed that while the synthetic ball was easier to hold onto when dry, it had less friction and became much harder to hold onto when wet. That’s because sweat stays on the surface of the synthetic balls but gets taken into the leather balls.
The scientists also tested bounce and found that the logo printed on the new balls made their surface uneven and caused them to bounce a little strangely compared with the leather balls.
In January, the NBA went back to using the leather balls. They aren’t perfect, but for now, that’s just the way the ball bounces.

Why were the synthetic balls expected to be used in NBA according to the text

A．Because they are easier to control.

B．Because they waste less material.

C．Because they look exactly alike.

D．Because they feel and bounce alike..
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