某甲因私仇蓄意杀害某乙。一天，某甲在某乙回家途中向其开枪射击，但未击中。这时，某甲尚

Passage One

The increase in leisure time, the higher standard of living, the availability of cars to a wider range of the population and, perhaps, a broadening of personal horizons have all contributed to a drastic change in the summer week-end habits of the British publiC. Now, on most Saturdays in the months loosely called summer, it is possible to see family saloons loaded with picnics and crammed to bursting with several generations of pleasure-bent Smiths’. Like competitors in some grossly disorganized rally, they nose their way through the neat drab streets of council estates, converging on the main roads, then crawl as best they can out into the open country and towards the coast.

Congestion and the frustration of wasting precious time at the receiving end of someone else’s exhaust fumes gets the pursuit of enjoyment off to had start; tempersbecome frayed. Children, traditionally the target for fathers’ ill-humor, are singled out for special treatment. The past week’s misdeeds are unearthed and magnified out of all reasonable proportion; mothers leap to their broods’ defense and, before long, vows that never again will this outing be repeated are being hurled back and forth. Of course, by this time, the children have wisely extracted themselves from the argument and are quietly amusing themselves by looking at their irate elders or gaping at the unfamiliar sight of animals in fields, often so much stranger to them than the corresponding naked shapes they are wont to see in butchers’ windows.

Eventually, tempers partially restored, the sea is in sight. The paraphernalia of enjoyment is set up on teeming beach, sand mysteriously appears in every sandwich, pale industrial legs are exposed in self-conscious nakedness.

The children drift away, quite capable of finding enough magic in this exciting, watery world to occupy them fully until they are gathered in again. Fathers and mothers, and quite possibly some members of a previous generation, settle back to receive the sun and dream away the tensions brought to a climax by the journey. Fathers eye with furtive lustfulness and mothers glare with disapproval and envy as the shapely matrons of tomorrow splash and play and race coquettishly around them, spraying water and sand and disturbing any hopes of peace.

At length the shadows drop and chill in the air brings an end to the idyll. The lobster skin is painfully covered up and the day’s debris half-heartedly collected. The family is rounded up and the brief dreams trodden into the sand along with the wasted paper.

The writer suggests that tempers become frayed because （）.

A．there are too many careless drivers on the roads

B．there are too many cars on the roads

C．the cars are crowded

D．the children are irritating

王老师想为希望小学五年级（2）班的同学购买学习用品，了解到某商店每个书包价格比每本词典贵6元，用123元正好可以买到3个书包和2本词典，则每个书包与每本词典的价格分别为多少？

如图所示，两个固定的点电荷所带电荷分别为Q₁＝＋q和Q₂＝－3q(q>0)，它们相距为L，A、B两点均在Q₁、Q₂的连线上，且在Q₁左边的某位置，现将一试探正电荷＋q₀从A点沿直线移动到B点的过程中，下列说法中正确的是

A．电场力可能先做正功再做负功

B．电场力一定做负功

C．电势能可能是先增大后减小

D．电场力一定是始终减小

有两把不同的锁和四把不同的钥匙，其中两把钥匙恰好分别能打开这两把锁，其余的钥匙不能打开这两把锁．现在任意取出一把钥匙去开任意一把锁．

（1）请用列表或画树状图的方法表示出上述试验所有可能的结果；

（2）求一次打开锁的概率．

危急保安器超速试验，应在同一情况下进行两次，两次动作转速差不超过0.6%。新安装或大修后的汽轮机危急保安器超速试验应进行三次，第三次和前两次平均数相差不应超过1%。