地球自转的周期约为____，地球公转的周期为____．

    I live in a small town near Xing'an in Guilin. You can't see it on the map of China, because it is too small. The air here is fresh(清新的). There are not many tall buildings in our town. The tallest building is in our school. There are four hundred students and twenty-five teachers in our school. In the front of the school, there is a playground. I often play basketball with my classmates on it. There is a little garden behind our school. And we can grow(种植) beautiful flowers and plant trees there. Next to the garden, there is an orange orchard(果园). You can hear birds singing everywhere. There is a river not far from our school. In summer, we usually go swimming with our teachers in it. We study Chinese, English, Maths and other subjects at school. The teachers are very nice. We love our school.

严复在《与熊纯如书》中说,“公等从事西学后，平心察理，然后知中国从来政教之少是多非。即吾圣人之精义微言，亦必既通西学之后，以归求反观，而后有以窥其精微，而服其为不可易也。”这表明严复对待中西文化的态度是

环境中影响生物形态、生理、分布的因素称为____．它又分为____和____．