陕西省澄城县2024~2025九年级第一学期期中质量检测评价英语x

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陕西省澄城县2024~2025九年级第一学期期中质量检测评价英语x试卷答案

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25. What does the underlined word “contemplating” in Paragraph 2 probably mean?1 A.Thinking about.B.Forgetting about.C.Preparing for.

We could, of course, just avoid these questions entirely, and rely on other types of research. But that doesn’t always work: sometimes, animal testing is tricky and uninformative, because the disease doesn’t develop in the same way as it would in humans. In contrast, challenge trials can be deeply informative within weeks, with far fewer volunteers. And the benefits can be surprisingly high.
In order to make sure we are as protected as possible from current and future threats, we should try to get rid of the misbelief in challenge trials, making them a more familiar part of our tool kits. Perhaps the greatest reward of all would be to make sure participants’ efforts are worthwhile: by designing trials to be fair and effective and applying them when and where they might make a real difference. In short, by helping them to save thousands, if not millions of lives.
1．The author tells the story of Edward Jenner with the intention of ________.
A. defining what are challenge trials.
B. showing the origin of the word “vaccination”.
C. emphasizing the importance of his vaccine.
D. introducing the topic of challenge trials.