题目

Plants are flowering faster than scientists predicted（预测）in reaction to climate change, which could have long damaging effects on food chains and ecosystems. Global warming is having a great effect on hundreds of plant and animal species around the world, changing some living patterns, scientists say. Increased carbon dioxide (CO2) in the air from burning coal and oil can have an effect on how plants produce oxygen, while higher temperatures and changeable rainfall patterns can change their patterns of growth. “Predicting species’ reaction to climate change is a major chal甲、乙两辆汽车都做匀速直线运动，其路程S随时间t变化的图象如图所示．从图象可知，    车的速度大；5S内乙车通过的路程是    m．