[单项选择]When you are near a lake or a river, you feel cool. Why The sun makes the earth hot, but it can’t make the water very hot. Although the air over the earth becomes hot, the air over the water stays cool. The hot air over the earth rises. Then the cool air over the water moves in and takes the place of the hot air. Then you feel the cool air and the wind, which makes you cool.
Of course, scientists can’t answer all of your questions. If we ask, "Why is the ocean full of salty" scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into the cracks. The rain then carries the salt into he earth and into the rivers. The rivers carry the salt into the ocean. But then we ask, "What happens to the salt in the ocean The ocean doesn’t get more slat every year." Scientists are not sure about the answer to this question.
We know a lot about our world. But there are still many answers that we do not have, and we are curious.
Peo
A. they know nothing about the world
B. they know little about the world
C. there are answers they do not have
D. they like it

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[单项选择]When you are near a lake or a river, you feel cool. Why The sun makes the earth hot, but it can’t make the water very hot. Although the air over the earth becomes hot, the air over the water stays cool. The hot air over the earth rises. Then the cool air over the water moves in and takes the place of the hot air. Then you feel the cool air and the wind, which makes you cool.
Of course, scientists can’t answer all of your questions. If we ask, "Why is the ocean full of salt" scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into the cracks. The rain then carries the salt into he earth and into the rivers. The rivers carry the salt into the ocean. But then we ask, "What happens to the salt in the ocean The ocean doesn’t get more slat every year." Scientists are not sure about the answer to this question.
We know a lot about our world. But there are still many answers that we do not have, and we are curious.
The
A. people feel cool when they are near a lake or river
B. scientists can explain everything we want to know
C. scientists can explain many things but not everything
D. the salt in the ocean comes from rocks

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[单项选择]

When you are near a lake or a river, you feel cool. Why The sun makes the earth hot, but it can’t make the water very hot. Although the air over the earth becomes hot, the air over the water stays cool. The hot air over the earth rises. Then the cool air over the water moves in and takes the place of the hot air. Then you feel the cool air and the wind, which makes you cool.
Of course, scientists can’t answer all of your questions. If we ask, "Why is the ocean full of salt" scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into the cracks. The rain then carries the salt into he earth and into the rivers. The rivers carry the salt into the ocean. But then we ask, "What happens to the salt in the ocean The ocean doesn’t get more slat every year." Scientists are not sure about the a
A. people feel cool when they are near a lake or river
B. scientists can explain everything we want to know
C. scientists can explain many things but not everything
D. the salt in the ocean comes from rocks

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[填空题]He (use)（）swim in that river when he was a little boy.

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Can you imagine how you would feel if you fell dangerously ill and could not reach or call a doctor Millions of people (1) the world are in this unfortunate (2) , living in distant places (3) there are no railways, no proper roads and no telephones. Thousands of (4) are lost every year (5) could have been saved if medical attention (6) in time. (7) today help could be brought quickly and easily (8) many of these people (9) full advantage was taken (10) the aeroplane. (11) country has proved this (12) than Australia. The Australians (13) greater use of the aeroplane than any (14) people in the world. In no other country (15) the total number of miles flown by the (16) person so high. In fact, it has been (17) that Australians jump into planes (18) people in other countries jump into trains and buses. It is not surprising, (19) that Australia shoul
A. when
B. while
C. as
D. but

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