D

    Two years ago, a 9-year-old girl from Massachusetts, US, wrote a letter to American President Barack Obama. "Why aren't there any women on the dollars or coins of the United States?" Sofia asked. "There are many women that could be on the dollars or coins because of the important things they've done." To her surprise on April 20, also her 11th birthday, Sofia got a call from the White House telling her that her wish will come true.

    Harriet Tubman, an African-American woman, will be on the face of the $20 bill, and the final design will be released(发布) by 2020, said US Treasury Secretary Jacob Lew. This means that Tubman will become the first woman in more than a century and the first black person to appear on the country's currency (货币).

    Tubman was born a slave (奴隶) in 1822. When she was 27, she made her escape. But Tubman wanted to help other slaves become free, so she later returned to the South 19 times and saved more than 300 people. She fought against slavery all her life.

    However, while Tubman is going on the new currency, women still bring home far fewer $20 bills than their men colleagues (同事). According to the Institute for Women's Policy Research, women are paid only 79 percent of what men are paid in the US.

    "Women have long been undervalued (低估)," said Susan Ades Stone from the US. "To put a great woman on the currency can remind us every day of women's value, abilities and contributions. At least it's a step in the right direction.

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    People already know a lot about animals. However, there are still some things about animals that may surprise you. Here are {#blank#}1{#/blank#}about animals you probably didn't know.

    Cows do have best friends and feel stressed when they are separated. Scientists have found that cows are very social animals and that a cow always {#blank#}2{#/blank#}other cows. When a cow is with its friends, it feels relaxed, compared with when it is alone.

    During a breeding season, a male penguin will offer a small stone to a female penguin as a gift. If she takes it, they will become partners. When the female penguin lays an egg, she and her partner may carry it {#blank#}3{#/blank#}, because some penguins don't build nests.

    Crocodiles (鳄鱼) swallow (吞) stones. Crocodiles always swallow their food instead of eating it like other animals. They swallow stones which break the food into very small pieces in their stomachs. These stones may stay in their stomachs {#blank#}4{#/blank#}.

    Elephants use plants to treat pain or other illnesses. Scientists once found a pregnant (怀孕的) elephant in Africa who ate a kind of plant which was not part of her normal food. Four days later, she {#blank#}5{#/blank#}a baby elephant. The same plant was used by the local pregnant women.

    It was Day 1 of our vacation on Cortes, a beautiful quiet island. "iPhone, iPhone, iPhone," my son kept moaning (呻吟). In front of him was a big window of facing the blue ocean. And a Coo gentle wind was coming in from the door. Clearly, he saw and felt none of it.

    Back at home, I'd soon give up and hand the phone over to him after five minutes of listening to this kind of moaning

    But not here. Before we left, I had told my, 10-year-old son the rule-no e-mails, no Facebook, no video games, and no iPhone. We came here to get away from them all' Here we were on our first day and already, he couldn't stand it.

    ____________I walked down the grass road to the beach and looked out to the sea. My 6-year-old daughter and my husband were drawing on pieces of wood. They were doing just fine.

    On Day 2, we spent the whole morning digging for shells(贝壳). This time, my son joined us. He collected .shellfish and other sea treasures. When we got back to our little wood house, I gave my son a book, and put him on the lovely garden chair. It was almost dinner when he looked up.

    The next few days passed in peace.

    On Day 6, my son was lying beside me on the beach, watching the sun going down. He was playing with the sand. And there was somethingshining.in his eyes, I realized how time slowed down for both of us. It was exactly what I wanted. Finally, we were able to sit quietly, without thinking about screens, phone calls and e-mails.

    A week away from all the electronics and life is good.