July 20, 1969 was an important day. Two {#blank#}1{#/blank#} (美国) astronauts planted the first human footstep on the moon. {#blank#}2{#/blank#} (他们的) names were Armstrong and Aldrin. They went into a spaceship whose name was Apollo. As Armstrong reached his left foot {#blank#}3{#/blank#} （touch） the moon's surface, he said, "That's one small step for a man, but one big leap for mankind."

    {#blank#}4{#/blank#} two hours and twenty-one minutes, the man carefully at first and then {#blank#}5{#/blank#} (勇敢), walked on the moon, {#blank#}6{#/blank#} （take）photos and picking stones.

    After eight {#blank#}7{#/blank#} (day) stay in space, Apollo returned to the earth successfully. People everywhere were {#blank#}8{#/blank#} (excite) by this moon trip. "This is the {#blank#}9{#/blank#} (伟大) week in the history of the world since the Creation(创世)," President Nixon told the travelers. "{#blank#}10{#/blank#}（多亏，由于）what you have done, the world has never been closer together before."

    The polar bear is found in the Arctic Circle and some big land masses as far south as Newfoundland. While they are rare north of 88°, there is evidence {#blank#}1{#/blank#} they range all the way across the Arctic, and as far south as James Bay in Canada. It is difficult to figure out a global population of polar bears as much of the range has been {#blank#}2{#/blank#} (poor) studied; however, biologists calculate that there are about 20,000-25,000 polar bears worldwide.

    Modern methods {#blank#}3{#/blank#} tracking polar bear populations have been employed only since the mid-1980s, and are expensive {#blank#}4{#/blank#} (perform) consistently over a large area. In recent years some Inuit people in Nunavut {#blank#}5{#/blank#} (report) increases in bear sightings around human settlements, leading to a {#blank#}6{#/blank#} (believe) that populations are increasing. Scientists have responded by {#blank#}7{#/blank#} (note) that hungry bears may be congregating (聚集) around human settlements, leading to the illusion (错觉) that populations are {#blank#}8{#/blank#} (high) than they actually are. Of {#blank#}9{#/blank#} nineteen recognized polar bear subpopulations, three are declining, six {#blank#}10{#/blank#} (be) stable, one is increasing, and nine lack enough data.

    We've all heard that breakfast is {#blank#}1{#/blank#} most important meal in the day. It may actually be true. Recently, a study of more than 50,000 adults aged 30 and older{#blank#}2{#/blank#}(find) that people who have breakfast are more likely to lose{#blank#}3{#/blank#}(weigh) than those who don't eat a morning meal. Other studies connect not eating breakfast{#blank#}4{#/blank#}a higher risk of high blood pressure, heart disease and so on.

    However, it's not just when you eat that matters, but{#blank#}5{#/blank#}you eat also matters. {#blank#}6{#/blank#}(keep)fit, you should have a balanced diet with protein, fiber and healthy fats, which is the key to a satisfying{#blank#}7{#/blank#}nutritious breakfast . If you want to keep{#blank#}8{#/blank#}(you) from being hungry later of the day, you'd better eat within 90 minutes after waking up. Also, coffee drunk on an empty stomach is not recommended because it can be{#blank#}9{#/blank#}(harm)to your body.

    There is an old saying that advises "Eat breakfast like a king, lunch like a prince, and dinner like a beggar. It is worth{#blank#}10{#/blank#}(follow).