假设一架战斗机正在空中某一高度做匀速飞行，另一架空中加油机给其加油，加油后战斗机仍以原来的高度和速度做匀速飞行，则战斗机的
| A．动能增加，势能减少，机械能不变 | B．动能不变，势能不变，机械能不变 |
| C．动能减少，势能不变，机械能减少 | D．动能增加，势能增加，机械能增加 |
如图是某同学做实验时的电路图。闭合开关S后，发现灯泡L1、L2均不亮，电流表示数为零，电压表示数等于电源电压，则该电路中的故障可能是：
| A．电源正极与a之间断路 | B．a、L1、b之间断路 |
| C．b、L2、c之间断路 | D．c与电源负极之间断路 |
Whether we find a joke funny or not largely depends on where we have been brought up．The sense of humour is mysteriously(神秘地)connected with national characteristics．A Frenchman ,for instance, might find it hard to laugh at Russian joke．In the same way, a Russian might fail to see anything amusing in a joke which would make an Englishman laugh to tears．
Most funny stories are based on comic situations．In spite of national differences, certain funny situations have a worldwide request．No matter where you live, you would find it difficult not to laugh at, say ,Charlie Chaplin’s early films．However, a new type of humour, which stems largely from America, has recently come into fashion．It is called “sick humour”．Comedians base their jokes on tragic situations like violent (cause by force)death or serious accidents．Many people find this sort of joke distasteful．The following example of “sick humour” will enable you to judge for yourself．
A man who had broken his right leg was taken to hospital a few weeks before Christmas．From the moment he arrived there, he kept on pestering(纠缠) his doctor tell him when he would be able to go home．He was afraid of having to spend Christmas in hospital ．Though the doctor did his best, the patient’s recovery was slow．On Christmas day, however, the doctor consoled(安慰)him by telling him that his chances of being able to leave hospital in time for New Year celebrations were good．The man took heart and, sure enough , on New Year’s Eve he was able to hobble(跛行) along to a party．To compensate(补偿)for his unpleasant experiences in hospital , the man drank a little more than what was good for him．In the process, he enjoyed himself and kept telling everybody how much he hated hospitals．He was still mumbling something about hospitals at the end of the party when he slipped on a piece of ice and broke his left leg．
【小题1】Whether you find “sick humour” funny or not will depend on ________．
| A．your having been brought up in America |
| B．the joke being related to a really comic situation |
| C．your ability to see the funny side of an unpleasant event |
| D．your ability to laugh until you cry |
| A．the doctor had failed to cure him |
| B．he was not able to be with his friends |
| C．being unable to walk, he did not enjoy the celebrations at the hospital |
| D．he thought he might also miss the New Year’s Eve celebration |
| A．no sooner was the out of hospital than he had to go back in again． |
| B．the man should not have said how much he hated hospitals |
| C．the man would be unable to walk for the rest of his life |
| D．the man had not got a leg to stand on |
| A．On New Year’s Eve, the man was able to walk properly to the party． |
| B．At the party , he enjoyed himself but only drank a little． |
| C．He had to go to hospital again though he hated it． |
| D．The man got well soon because the doctor took good care of him． |
Everyone ____some book
| A．has | B．have | C．there are | D．is |
Everyone ____some book
| A．has | B．have | C．there are | D．is |
Everyone ____some book
| A．has | B．have | C．there are | D．is |
联系的普遍性的表现是
| A．每一事物内部的联系 | B．一事物与他事物的联系 |
| C．世界是相互联系的整体 | D．世界的普遍联系通过中介来实现 |
联系的普遍性的表现是
| A．每一事物内部的联系 | B．一事物与他事物的联系 |
| C．世界是相互联系的整体 | D．世界的普遍联系通过中介来实现 |
在空间四边形
中，
、
分别是
和
的中点，
，
，
则
和
所成的角是（ ）
0 65584 65592 65598 65602 65608 65610 65614 65620 65622 65628 65634 65638 65640 65644 65650 65652 65658 65662 65664 65668 65670 65674 65676 65678 65679 65680 65682 65683 65684 65686 65688 65692 65694 65698 65700 65704 65710 65712 65718 65722 65724 65728 65734 65740 65742 65748 65752 65754 65760 65764 65770 65778 235360
中，、分别是和的中点，，，则
和所成的角是（ ）A． | B． | C． | D． |