问题
选择题
As a result of __ is now known in physics and chemistry, scientists have been able to make important discoveries in biology and medicine.
A．it
B．what
C．which
D．that
答案
B
题目分析：句意：由于在物理学和化学上已知的知识的原因，科学家们已经能够在生物学和医药上取得重要发现。what 引导宾语从句，在从句中做主语。在宾语从句中，which 是哪一个，that不做成分。故选B。
考点: 考查从句关系词的用法。