水蒸气通过炽热的炭层时，发生的反应为C + H₂O   ^高温  H₂ + CO，该反应属于基本反应类型中的（）

 周末，小红和爸爸来到浏阳赤马湖的滑雪场，开始他们的滑雪之旅，到了雪地，小红脱下运动鞋换上了滑雪鞋，这时她对地面的压强会____ （选填“增大”、“减小”或“不变”）；若小红的体重较轻，她和爸爸在水平雪地上滑行时滑板受到的摩擦力分别为F₁和F₂，则F₁____ F₂（选填“＞”、“＜”或“=”）

先天愚型是一种遗传病，控制正常性状的基因为B，控制致病性状的基因为b。现有一对表兄妹，均表现正常，他们婚后生有一个先天愚型的孩子，根系后回答：
他们三人的基因型是：
父：____          母：____       孩子：____ 

    A new research on students' sleeping habits says that more than 70% of students do not get enough sleep.

    Researchers found that primary school students get 9 hours and 10 minutes of sleep a night, junior high school students get 8 hours and 6 minutes, and senior high school students get 7 hours and 9 minutes. None of those hours are enough for each group. Not enough sleep can cause many kinds of problems in children and teenagers.

    In 2007, Shanghai Municipal Education Commission asked primary and middle schools in the city to adjust their timetables so that students could get more sleep. Two years later, a research found that students at schools that adjusted their timetables got more sleep than in 2005.

    The researchers hope that the government will take measures to make students have enough sleep. Students in other places may even less sleep than those in Shanghai.