The book fair has received a positive ________ from readers.
正确答案： B
本题解析：
A 结果，效果 B 反应，回答 C 解决，协议 D 解决，解答
The professor asked a question, and David ________ a good answer.
He would have given you more help, if he ________ so busy.
After months of voyage, Columbus arrived in ______ later proved to be a new continent.
It rained hard yesterday, ______ prevented me from going to the park.
It is important to ________ your skin from the harmful strong sunlight.
He was ______ to withdraw from running for the presidency.
The two girls competed with each other ______ the highest mark.
If the operation ________ carefully prepared, it would not have been successful.