Betty wrote to her grandma about her visit with Jenny in Paris．Her aunt and uncle met{#blank#}1{#/blank#}at the airport on Wednesday．On Thursday they visited the Louvre Museum with many world—famous{#blank#}2{#/blank#}of art．Then they enjoyed dinner in a French restaurant．On Friday morning they took a walk in the street markets and did some shopping．Betty{#blank#}3{#/blank#}a present for her grandma．On Friday afternoon they went to the top of the Eiffel Tower with lots of{#blank#}4{#/blank#}．It was wonderful for them to see all the lights{#blank#}5{#/blank#}at night．On Saturday they will take a boat tour on the River Seine．    

    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.