Scientists agree that it will be a long time before____（我们找到治愈癌症的方法）

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答案解析

We find the cure for cancer.

【权威解析】首先根据句子的已知部分，可以判断出填写的部分用一般现在时;其次，要注意汉语提示部分是“治愈”而不是“治疗”，因此要用cure 而不能用treat，这就提醒我们学习单词的时候一定要注意细节，否则用错了，分数就丢掉了;所以，本题的正确答案是we find the cure for cancer

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3 Passage 1

Since early times, people have been fascinated with the idea of life existing somewhere else besides earth. Until recently, scientists believe that life on other planets was just a hopeful dream. But now they are beginning to locate places where life could form. In 1997, they saw evidence of planets near other stars like the sun. But scientists now think that life could be even nearer in our own solar system. One place scientists are studying very closely is Europa, a moon of Jupiter. Space probes have provided evidence that Europa has a large ocean under its surface. The probes have also made scientists think that under its surface Europa has a rocky core giving off volcanic heat. Water and heat from volcanic activity are two basic conditions needed for life to form. A third is certain basic chemicals such as carbon, oxygen and nitrogen. Scientists believe there might be such chemicals lying at the bottom of Europa’s ocean. They may have already created life or may be about to. You may wonder if light is also needed for life to form. Until recently, scientists thought that light was essential. But now, places have been found on earth that are in total blackness such as caves several miles beneath the surface. And bacteria, primitive forms of life, have been seen there. So the lack of light in Europa’s sub-surface ocean doesn’t automatically rule out life forming.
根据材料回答第题。
What did scientists once believe according to the passage?

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