2. 外语
  3. If a fever continues to exist, a doctor should be called since this may mean that a more serious infection is present.

If a fever continues to exist, a doctor should be called since this may mean that a more serious infection is present.

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问题 If a fever continues to exist, a doctor should be called since this may mean that a more serious infection is present.
选项 A、disappears
B、persists
C、perishes
D、vanishes
答案B
解析 to continue to exist“持续，坚持”。其余选项或多或少与“消失”有关。句子大意：如果高烧不退，就应该请医生来，因为这可能意味着有更严重的感染。
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