A. the rotation of the earth B. the revolution of the earth C. the gravity of the earth D. the magnetic field of the E. arth 相关知识点: 试题来源: 解析 A。地球的自转(rotation)导致了昼夜交替。选项 B 地球的公转导致四季变化;选项 C 地球的重力与昼夜交替无关;选项 D 地球的磁场与昼...
Day and night are caused by ___. A. the sun B. the moon C. the stars D. the E. arth's rotation 相关知识点: 试题来源: 解析 D。解析:昼夜交替是由地球自转引起的。选项 A“the sun”太阳提供光和热,但不是引起昼夜交替的原因;选项 B“the moon”月亮影响潮汐等,但不是昼夜交替的原因;...
“Life on Earth is kind of a box of spare parts for the inventor,” he says. “You put organisms in new relationships and observe what’s happening. Then you let these new systems develop their own ways to self-repair.”1. What can we learn about John from the first two paragraphs?
with a radius equal to the distance between Earth and our most distant spacecraft, Voyager 1. Using the formula C=2pir with fifteen decimal places of pi, you’d only be off on the true circumference of the circle by a centimeter or so. On solar scales, there’s no need to go ...
2. What are TB symptoms? The main suspicious symptoms of pulmonary tuberculosis include coughing and expectoration for more than 2 weeks or blood-tinged sputum. Other symptoms may include chest pain, chest tightness, difficulty breathing, l...
caused(cause) by human activities like garbage and waste water treatment and oil leaks.This year the main purpose of the Day is to inform a(3) wider(wide) public of the impact of human actions(4) onthe ocean,expecting more people(5) ...
Evangelicals Call for Action on Climate Change More David McNew|Getty Images Young evangelicals are gathering across the nation for days of prayer and other events this week, similar to the prayer event seen here in February 2013, to call for greater action on climate change issue...
an official at the local forestry and grassland bureau(林草局).“By 8 (build) the food base,more elephants will stay inside the area. So they won't go into the nearby villages and cause conflicts(冲突)between humans and elephants. As long as there are enough food,the elephants will stay...
Ahead of World Naked Gardening Day on May 4, LawnStarter ranked 2024’s Best Cities for Naked Gardening.We compared 500 of the biggest U.S. cities based on 4 categories – Nude Gardener Friendliness, Local Interest, Weather Forecast, and Safety. Specifically, we considered the number of ...
people with phobias(恐惧)have an extreme fear response that causes both physical and psychological pain.In everyday life,some phobia triggers(诱因)are much easier to avoid than others.For instance,people who suffer from a fear of bats are highly unlikely to be troubled by ...