问题
填空题
5÷7的商用分数表示是（ ），用循环小数表示是（ ），用精确到0.01的小数表示是（ ）。
答案
；
；0.71
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5÷7的商用分数表示是（ ），用循环小数表示是（ ），用精确到0.01的小数表示是（ ）。
；；0.71
| 阅读理解。 |
| Everyone may know tree rings tell us how old a tree is. But do you know they can tell us what the weather was like? A tree grows well in a climate (气候) with lots of sunlight and rainfall (雨量). And little sunshine or rainfall limits (限制) the growth of a tree. We can see the change of climate by studying the tree rings. For example, to find out the weather of ten years ago, you can count the rings of a tree from the outside to the inside. If the tenth ring is far from the eleventh ring, then we are sure that it was sunny and rainy most of that year. If it is near to the eleventh ring, then the climate of that year was bad. |
| 1. Tree rings can tell us not only the ___ of a tree but also the ___. |
[ ] |
| A. age; weather B. rainfall; sunshine C. age; rainfall D. sunshine; age |
| 2. ___ in good climate. |
[ ] |
| A. Tree rings grow far from each other B. Tree rings become thinner C. Trees don't need sunshine or rainfall D. Tree rings grow near each other |
| 3. From the passage we know, trees need ___ to grow. |
[ ] |
| A. sunlight and tree rings B. rainfall and rings C. sunlight and rainwater D. water and insects |
| 4. According to the passage, if the thirty-first ring is near to the thirty-second ring, the climate of that year was ___. |
[ ] |
| A. sunny B. rainy C. bad D. unknown |
| 5. If you want to find out the weather of twenty years ago, you should study__ of a tree from the outside to the inside. |
[ ] |
| A. the twentieth ring B. the tenth ring C. the ninth ring D. the twenty-first ring |
