As we admire the Full Moon on the night of the Mid-Autumn Festival, have you ever thought of the relationships among the Sun, Earth and the Moon? ____1____

As Earth turns, sometimes we face the Sun. ____2____ When Earth’s spin (旋转) turns us away from the Sun, we get night. That’s when people on the opposite side of Earth face the Sun. At that time, those people have day while we have night.

____3____ Unlike the Sun, it doesn’t make its own light. It can only reflect the light from the Sun. The Sun lights up only the side of the Moon that faces the Sun. At Full Moon, the Moon is on the opposite side of Earth from the Sun. ____4____ During the Full Moon, the Moon rises around sunset (日落), and sets around sunrise.

But moonlight is so bright that you can sometimes see it during the day too. A few days before Full Moon, if you look east in the afternoon, you may see the Moon. And for a few days after Full Moon, you can find it if you look west in the morning. But the Moon is most difficult to see at New Moon, when it is between Earth and the Sun. At that time, the side of the Moon facing Earth is dark. ____5____ How amazing it is to see the changes of the Moon!

According to the changes, humans created the calendar. Remember that many humans’ achievements are based on the simplest things—glancing at the sky. Are you brave enough to join in exploring space?

A. As a result, the Moon can’t be seen at all.

B. The Moon is a different story.

C. The following is my advice for you.

D. That is when we get day.

E. Let’s take a journey to see how they move.

F. Then the side of the Moon facing Earth is all lit up.

1.1.

A

B

C

D

解析：选E。前文提出问题，思考太阳、地球和月亮之间的关系。E选项“让我们开启一段旅程看看它们如何运动”引出下文讲解，起到承上启下作用，故填E。

2.2.

A

B

C

D

解析：选D。后文当地球旋转把我们转离太阳，就形成夜晚。本句讲朝向太阳的情况，D选项“那就是我们拥有白天的时候”和后一句形成白天黑夜对比，故填D。

3.3.

A

B

C

D

解析：选B。下文讲月亮自身不会发光，只能反射太阳光。前面段落讲地球自转形成昼夜，现在话题切换到月亮。B选项“月亮则是另一回事”转换话题，故填B。

4.4.

A

B

C

D

解析：选F。前文说满月时月亮处在地球背对太阳的一侧。F选项“这时朝向地球的月球一面全部被照亮”解释满月成因，故填F。

5.5.

A

B

C

D

解析：选A。新月的时候，月亮位于地球和太阳之间，朝向地球的一面是黑暗的。A选项“结果我们完全看不见月亮”承接上文因果关系，故填A。