分析资料：人类征服疟疾的历程

疟疾是世界上最严重的疾病之一．早在两千年前，疟疾就在世界各地流行．许多科学家都想找出引发疟疾的原因，以便能更好的预防和减少这种病的发生．当时，科学家们观察居住在沼泽地区人群的患病情况，提出假设：疟疾是由于沼泽的水被污染而引起的．同时，设计了让人直接喝沼泽地里污水的实验．结果喝污水的人没有患疟疾，假设被否定了．科学家们又经过长期的探索，到了19世纪后半叶，发现疟原虫是疟疾的致病“凶手”．有些科学家还发现，在疟疾的发病区，抽干沼泽地里的水，这个地区患疟疾的人就大大减少了，甚至消失了．科学家们就思考：引起人体患疟疾的疟原虫和沼泽地里的水有什么关系呢？直到本世纪初，一位意大利科学家通过大量观察提出了一个新的假设：蚊子传播了疟疾．蚊子在水中繁殖，如果抽干了沼泽地里的水，就可以消灭蚊子的幼虫，消灭了蚊子就可以消灭疟疾．又过了若干年，一位英国医生设计了一个巧妙的实验来验证这个假设．他让蚊子去叮咬体内有疟原虫的麻雀，再解剖发现在蚊子的唾液腺里有大量的疟原虫．这样人类终于弄明白了人体患疟疾的原因，并且制定了一系列治疗和预防疟疾的方法．

某化学小组为测定一定质量的某铜铝混合物中铜的质量分数，设计了如下实验方案：
方案Ⅰ：铜铝混合物  测定生成气体的体积  
方案Ⅱ：铜铝混合物  测定剩余固体的质量  
下列有关判断中不正确的是：

EVENTS

Aug.31-Sept.4,Laughter Bus

Cape Town, South Africa

Lovely sightseeing tour with laughter, fun and festivities. The tour departs(启程) from Cape Town towards the Garden Route, stopping at beautiful and interesting places, enjoying lunch at the seaside and sharing laughter with local communities. Cost:$800.

+277222-97454, info@laughterbus.co.za  Sept. 17-18, Laughter Yoga 2-day Certified Leader Training

Irvine, California, USA

10 am-5 pm daily at Irvine Valley College. Learn to laugh for health without the need of jokes. Start a laughter club, share laughter with elders and kids, and earn income sharing happiness. Includes practice with Jeffrey Briar. Costs: $ 295.

▪ (949)376-1939, JBriar@LYInstitute.org

Set. 30, Laughter is Serious Business Workshop

St. Albans, Hertfordshire, UK

A workshop for those who have completed Laughter Leader/Skills courses and want to get ideas and real advice on how to promote(提升) themselves. 10 am-3 pm with lunch break. Costs:￡100 (includes a￡25 DVD)

+44(0)1727-741-050, Jotte@unitedmind.co.uk Oct. 7-9, Laguna Laughter Club Mountain Retreat(静修)

Angelus Oaks, California, USA

Everyone is welcome on this three-day retreat in the pine forest of Redlands. Daily laughter yoga sessions, music, dancing, hiking, and vision-sharing. Costs:$150 (includes meals).

▪ (949)376-1241, Anne@LaughingAnne.com

Oct. 29-Nov. 5, Laughter Cruise in the Caribbean

The tour departs from Miami, Florida, USA. Daily laughter sessions, onboard programs, easy yoga classes, creating new exercises, fun and friendship! Holland America Lines. Costs: $719.

▪ (941) 349-6069, amy.ferrell@verizon.net