The underlined phrase function below their ability shown by test scores means the under-achievers ________.A. often get low scores in testsB. do worse in actual learning than in testsC. usually do better in tests than the over-achieversD. are always slow in learning and have to make more efforts

我们来分析这个题目。

题目是：

The underlined phrase "function below their ability shown by test scores" means the under-achievers ______.

选项是：

A. often get low scores in tests
B. do worse in actual learning than in tests
C. usually do better in tests than the over-achievers
D. are always slow in learning and have to make more efforts

第一步：理解划线短语的意思

划线短语是："function below their ability shown by test scores"

• function：在这里是“表现”或“运作”的意思。
• below their ability：低于他们的能力。
• shown by test scores：通过考试成绩所显示出来的能力。

所以整个短语的意思是：

> 他们在实际表现上低于考试成绩所显示的能力。

换句话说，这些学生在考试中表现不错，但在实际学习或应用中却不如考试成绩所显示的那样好。

第二步：分析选项

A. often get low scores in tests
意思是“经常在考试中得低分”。这与原句不符，因为原句说“考试成绩显示他们的能力”，说明考试成绩并不低。

B. do worse in actual learning than in tests
意思是“在实际学习中表现比考试中差”。这正好对应划线短语的意思，即他们在实际学习中表现不如考试成绩所显示的能力。

C. usually do better in tests than the over-achievers
意思是“通常在考试中比高成就者表现更好”。这与题干无关，没有提到“高成就者”。

D. are always slow in learning and have to make more efforts
意思是“总是学习慢，需要付出更多努力”。这虽然可能是某些学困生的特点，但并没有直接对应“function below their ability shown by test scores”这个短语的含义。

第三步：得出结论

最符合划线短语含义的选项是：

B. do worse in actual learning than in tests

✅ 最终答案：

$\boxed{B}$