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问题 选择题

下列水果种植在北方地区的是（　　）

A．柑橘  荔枝

B．苹果 梨

C．芒果、香蕉

D．青稞、豌豆

答案

北方地区的年降水量大致在400～800毫米之间，这就决定了区内农业以旱作为主．因气候关系，长城以北一般只能一年一熟，主要农作物有春小麦、玉米、高粱、大豆、马铃薯、甜菜等．长城以南则两年三熟或一年两熟，冬小麦能够越冬，还可以连种玉米、棉花、荞麦、甘薯、谷子等农作物．东北的大、小兴安岭和长白山，是我国森林资源的宝库．本区盛产温带水果，比如苹果、梨、桃、杏、柿、枣、葡萄等．地方特产也很丰富，著名的有东北“三宝”（人参、鹿茸、貂皮）、洛阳牡丹、兰州白兰瓜等．

故选：B．

填空题



Every human being is fallible; we make mistakes. In America when a mistake has been made, it is considered fitting for the person (1) to acknowledge his or her error and to apologize to anyone who has been inconvenienced. Even (2) are expected to admit their mistakes and apologize for them. Trying to (3) a mistake and denying your guilt are considered to be indicative of serious (4) .
If you make a mistake that (5) a group of people, a public apology is considered the best method for (6) . If the mistake was a serious one, or if some people were inconvenienced more than others, then the (7) should follow the public apology with private ones to (8) .
It is especially important for executives and company heads to be able to admit their mistakes. Sometimes leaders are afraid that if they (9) , they will lose the respect of their employees. Actually (10) — if you are honest with your employees and yourself, (11) , and show that you are willing to accept blame when you make a mistake, then your employees will be (12) you. They will also be more likely to admit their own mistakes.
If you (13) one person, it is usually best to apologize to that person alone, unless your mistake (14) by a large group of people. For example, if Leonard (15) to Mr. Todd during a committee meeting, it would be (16) for Leonard to apologize to Mr. Todd at the next committee meeting. If the (17) created by the initial mistake is public, then the apology should be public. However, if Leonard raised his voice to Mr. Todd when only the two of them (18) , he may apologize privately. Notice as well (19) the apologies are. As soon as you realize you have made a mistake, you should (20) .
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单项选择题

有关系模式A(C，T，H，R，S)，根据语义有如下函数依赖集：F={C→T，(H，R)→C，(H，T)→R，(H，S)→R}，则关系模式A的码是( )。

A．C

B．(H，T)

C．(H，R)

D．(H，S)
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