There is an old saying in English: "Laughter is the best medicine". Until recently, few people took the saying very seriously. Now, however, doctors have begun to investigate laughter and the effects it has on the human body. They have found evidence that laughter really can improve people’ s health.
Tests were carded out to study the effects of laughter on the body. People watched funny films, while doctors checked their heart rate, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. It increases blood pressure, the heart rate and the rate of breathing; it also works several groups of muscles in tile face, the stomach, and even the feet. If laughter exercises the body, it must be beneficial.
Other tests have shown that laughter appears to be capable of reducing the effect of pain on the body.
There is also some evidence to suggest that laughter helps the body&rs
| Most people agree that fencing (击剑) is
one sport in which a person must be at least 30 years old before he learns all
he needs to know about the sport. {{U}} (36) {{/U}}Clark Summers of the
University of Detroit{{U}} (37) {{/U}}that this doesn’t always have to
be{{U}} (38) {{/U}} Clark is a different kind of fencer in a lot of{{U}} (39) {{/U}}. He is American, while most fencers are from the{{U}} (40) {{/U}}of Europe. He is black while most fencers in the past have been {{U}} (41) {{/U}} And he is{{U}} (42) {{/U}}22 years old. Many people{{U}} (43) {{/U}}that Clark is the most promising fencer in this country today. Although he is young, he has been able to 44 the necessary skills. Already he has won a number of fencing contest (况赛) {{U}} (45) {{/U}} older fencers. A. a fencer B. a winner C. missed D. killed [单项选择]辅助支承限制（）个自由度。
A. 0 B. 1 C. 2 D. 3 [单项选择]电磁离合器是装在压缩机主轴上的，他起的作用是（）
A. 通电或断电时，可以控制冷凝器停或开 B. 通电或断电时，可以控制发动机停或开 C. 通电或断电时，可以控制风扇停或开 D. 通电或断电时，可以控制压缩机停或开 [单选题](48212)采用乙炔切割或烧孔的钢轨,必须在( )内更换。(1.0分)
A.8h B.12h C.4h D.3d [判断题]( )从变压器空载时等值电路图看出,为了减小变压器励磁电流,应采用高导磁率的铁芯材料,以减小励磁阻抗。
A.正确 B.错误 [单选题]右下腹包块，有压痛、固定,可见于
A.右侧输卵管炎 B.右侧输卵管癌 C.妊娠子宫 D.子宫肿瘤 E.膀胱 [填空题]民爆销售企业、购买单位都应在成交( )日内,向所在地县级公安机关备案,销售企业还需报省级民爆主管部门。
[多选题]对《游桂林诸山记》的作者袁枚，介绍正确的是（）
A.字子才 B.号简斋、随园老人 C.浙江钱塘（今杭州）人 D.清代诗人，论诗主张抒写性情，创“性灵”说 E.清康熙年间进士，曾任江宁等地知县，辞官后侨居江宁，筑园林于小仓山，号随园 [判断题](判断题).( )如果发动机每次启动都超过30..秒钟或连续踏启动杆在10..次以上才能启动,均属启动困难。
A.正确 B.错误 [单选题]1.196.第196题电池欠压表示待分拣电能表的电池电压过低,包含()欠压、抄表电池欠压
A.屏显 B.输入电压 C.时钟电池 D.内附电池 [判断题]1212客户在申请验表期间,其电费可暂不按期交纳,验表结果确认后,再行退还电费。 ( )
A.正确 B.错误 [单项选择]要成为特级导游员，其资历要求取得高级导游员资格（）年以上。
A. 1年 B. 2年 C. 3年 D. 4年 [判断题]掺外加剂混凝土的凝结时间差性能指标中的“－”号表示提前，“＋”号表示延缓。
A.正确 B.错误 [判断题]人工拆除建筑的栏杆、楼梯、楼板等构件,应与建筑结构整体拆除进度相配合,不得先行拆除。
A.正确 B.错误 [单选题]不属于半污染区的是( )
A.治疗室 B.护士站 C.卫生间 D.消毒室 E.内走廊 [单项选择]原发性肝癌最主要的播散途径是（）
A. 肝内门静脉系统 B. 直接转移 C. 淋巴系统 D. 血液系统 E. 种植转移 [多选题]常见的双极型器件有(____)。
A.GTR B.GTO C.IGBT D.MOSFET 我来回答: 提交
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