要使两物体间的万有引力减小到原来的 $\frac{1}{4}$ ，下列办法可采用的是（　　）

请认真阅读下列短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项。

Tom had retired (退休） and lived by himself a long way from town. He seldom left his home. But one day he went into town to buy some things in the market, and after he had bought them, he went into a restaurant and sat down at a table by himself. When he looked around, he saw several old people put eyeglasses before reading their newspapers, so after lunch he decided to go to a store to buy himself some glasses too. He walked a long the road, and soon found a store.

    The man in the store made him try on a lot of glasses, but Tom always said, "No, I can't read with these."

    The man because more and more puzzles, until finally he said, " Excuse me, but can you read at all?"

    "No, of course I can't!" Tom said angrily, "If I was already able to read, do you think I could have come here to buy glasses?"

    In this day and age taking a photograph is easier than ever. There are cameras built into our phones, computers, iPods…The way we share photos has also changed. There was a time when you'd print your photos and put them into photo albums, but because of the advance in technology, all in technology, all this has changed.

    Not only do we have what seems like an endless amount of space to store photos on our devices, but we also have the Internet, especially social media. Social networks such as Facebook allow us to post our pictures and albums to share friends and family.

    While you could argue this easy ability to store, share and enjoy photos is fantastic, it could also be said that photographs have lost some of their meaning. I have over 1000 pictures on my smart phone and several thousand stored on my computer. I love posting my pictures on Facebook. Sometimes, however, I try to ask myself, will I really want to look back at this picture of a coffee or a selfie taken in a bathroom by myself? Probably not.

    Even though I'm guilty about sometimes taking meaningless and boring pictures like this, a couple of years ago, I decided to find a way to make my photographs more meaningful. How did I do this? Disposable （一次性）cameras! When I go on a trip, I always try to take a disposable camera. With only 27 pictures you can take, you really think about the photograph straight away. And finally, it's so much fun to get the pictures developed and look through them again.

    I admit that I couldn't live without social media or taking photographs with my smart phone, but I do think taking photographs has become less meaningful. That's why I'll continue using disposable cameras. It's a great way to make your photographs more meaningful.