下列说法正确的是（ ） A．氧化还原反应的实质是元素化合价的升降 B．化学反应中

有一个留学生，在乘坐的飞机上，笑嘻嘻的递给空中小姐一张纸条，写着："我身上有炸弹，我要劫机。"空姐笑了笑，取走了纸条。当飞机降落时，地面上许多警卫人员荷枪实弹把飞机层层包围。虽然那个学生大喊："我只是开个玩笑，周围的人都知道，他们可以作证。"但是没有用。他被压上警车，并要面对法律的裁决。

(1)开玩笑犯法吗？

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(2)如果人们无意之中犯法，可以原谅吗？

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(3)如果有人怂恿你，你会这么做吗？

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男性，65岁，持续性上腹部疼痛半年，消瘦、贫血、乏力，偶有恶心、呕吐。查体呈贫血貌，上腹部剑突下轻压痛。应采用哪种辅助检查确定诊断

A．X线上消化道造影

B．胃液分析

C．B超检查

D．纤维胃镜检查

E．血清胃泌素测定

大剂量肾上腺素静脉注射，血压的变化是

A．收缩压和舒张压均缓慢而持久的升高
B．收缩压上升，舒张压不变或稍下降
C．收缩压上升，舒张压上升，脉压变小
D．收缩压上升，舒张压上升不多，脉压增大
E．收缩压上升，舒张压下降，脉压增大

安全态度是在长期的对（）较重的认知过程中形成的。

A、全安性

B、危险性

C、稳定性

However important we may regard school life to be, there is no denying the fact that children spend more time at home than in the classroom. Therefore, the great influence of parents cannot be ignored or discounted by the teacher. They can become p allies of the school personnel or they can consciously or unconsciously hinder and frustrate curricular objectives.

Administrators have been aware of the need to keep parents informed of the newer methods used in schools. Many principals have conducted workshops explaining such matters as the reading readiness program, manuscript writing and developmental mathematics.

Moreover, the classroom teacher, with the permission of the supervisors, can also play an important role in enlightening parents. The informal tea and the many interviews carried on during the year, as well as new ways of reporting pupils’ progress, can significantly aid in achieving a harmonious interplay between school and home.

To illustrate, suppose that a father has been drilling Junior in arithmetic processes night after night. In a friendly interview, the teacher can help the parent sublimate his natural paternal interest into productive channels. He might be persuaded to let Junior participate in discussing the family budget, buying the food, using a yardstick or measuring cup at home, setting the clock, calculating mileage on a trip and engaging in scores of other activities that have a mathematical basis.

If the father follows the advice, it is reasonable to assume that he will soon realize his son is making satisfactory progress in mathematics, and at the same time, enjoying the work.

Too often, however, teachers’ conferences with parents are devoted to petty accounts of children’s misdemeanors, complaints about laziness and poor work habits, and suggestion for penalties and rewards at home.

What is needed is a more creative approach in which the teacher, as a professional adviser, plants ideas in parents’ minds for the best utilization of the many hours that the child spends out of the classroom. In this way, the school and the home join forces in fostering the fullest development of youngsters’ capacities.

The author directly discusses the fact that（）

A. parents drill their children too much in arithmetic

B. principals have explained the new art programs to parents

C. a parent’s misguided efforts can be properly directed

D. a father can have his son help him construct articles at home