题目内容
A number of amateur________ build their own observatories in or near their homes, and they supplement the work of professional observatories with their own equipment.
查看答案
搜索结果不匹配？点我反馈
更多问题
The celebration of Labour Day, in honour of the working class, was______ in the United States in 1882.
The invention of the printing press set _________ a social revolution that is still in progress.
The tour descriptions are quite detailed and include comprehensive day-by day _________.
Many old statues in that temple that have long been _______ have lost their paint and grown dark with age.
微信支付 
支付宝支付