In addition to that, it also has a very long orbital period. Basically, it takes Uranus a little over 84 Earth years to complete a single orbit of the Sun. What this means is that a single year on Uranus lasts almost as long as a century here on Earth. On top of that, because of...
而不是：a solar year takes the earth to complete one revolution round the sun.如果选D，就变成了第二种情况，这明显不对（不符句型结构）回过头来看整句，其实是：A solar year is the length of time _(that) it takes_ the earth to complete one revolution round the sun.注意这里是省...
The early Romans created a calendar based on the cycles of the moon. However, when Julius Caesar became Emperor of Rome around 45 B.C., he introduced the Julian calendar. This calendar marked time by measuring the Earth’s revolution around the sun. A few centuries later, Pope Gregory XIII...
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