Ⅰ.单句语法填空
1．He is an expert ________ the field of Chinese medicine.
2．They are trying to find a cure________ Alzheimer’s.
3．Some students have no concept of participating in doing ________ (experiment)．
4．Zhong Nanshan took ________ (effect) measures to prevent COVID-19 from getting bad to worse.
5．After the president made an official announcement, she expressed her ________ (person) opinion.
【答案】1.in 2.for 3.experiments 4.effective
5．personal
