下列叙述正确的是（ ） A．施力物体同时一定是受力物体 B．作用力与反作用力可能

阅读下列材料并回答问题。材料一：1938年9月底，英、法、德、意四国在慕尼黑举行会议，并签订了《慕尼黑协定》。协议规定：捷克斯洛伐克的苏台德区和与奥地利接壤的南部地区割让给德国，捷方应于10天之内从上述领土撤退完毕；英法应对捷克斯洛伐克的新边界安全给予“国际保证”。 ——摘自北师大版历史教材九年级下册

材料二：我不知道你们的国家是否会从慕尼黑作出的决定中得到好处，但肯定无疑的是，我们不会是最后一个受害者。在我们之后，其他人也将遭遇同样的命运。——捷克斯洛伐克外交部长

（1）根据材料一，指出英法等国奉行的政策是什么？

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（2）结合所学知识，指出《慕尼黑协定》的实质是什么？

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（3）材料二中捷克斯洛伐克外交部长的话对吗？为什么？

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We will learn how to operate the machine _______.

A．at a time

B．at one time

C．at the time

D．in time

自信是获得成功的前提，因此要想成功，只要有自信就足够了。（        ）

导向块在深孔加工中起到了导向作用外，还可以减小（）。

A.尺寸误差

B.刀具的磨损

C.偏歪现象

D.圆度误差

Home prices slid in November, raising questions about whether the housing recovery is robust enough to maintain a sustained turnaround. From October to November, home prices fell 0.2% after (1) 0.1% in October, according to a report Tuesday by Standard & Poor’s/Case-Shiller’s home price index. (2) five of the 20 metro areas (3) by the index saw price increases for the month.

On a(n) (4) basis, prices were 5.3% lower in November than in November 2008. Prices were the same as in late 2003. "What we’ve seen (5) the past couple of months is that the pace of (6) has fallen down," says Maureen Maitland of Standard & Poor’s. "Some markets have (7) Is that because we haven’t (8) the foreclosure (回赎权的取消) cycle Because of unemployment We’re not seeing the (9) we were seeing in the last summer months. "

Metro areas that have seen a retreat in home prices (10) Seattle, Charlotte, Las Vegas and Tampa. All four (11) gains they made in recent months (12) . (13) , for the 20-metro index, the annual rate of decline is improving. That (14) , with other recent housing reports that show prices (15) or accelerating, could point to (16) the housing market is starting to (17) its footing, some economists say. Existing home sale prices were $178 300 in December, which is 1.5% higher than December 2008, according to a report this week by the National Association of Realtors. That was the first year-over-year (18) in median price since August 2007.

"The most (19) thing we can say is not only the market is stabilizing, but we’ve seen that housing demand is p," says Bernard Baumohl, with the Economic Outlook Group. "Housing probably will continue to climb upwards through the summer, (20) it could slip a little as the tax credit expires. \

18（）

A.gain

B.accomplishment

C.achievement

D.success