单项选择题
A.at will
B.at random
C.on purpose
D.on easy
单项选择题 High speed aircraft is made of metals that can()both high temperature and pressure.
单项选择题 A large sum of money has been raised for the()of the poorly educated children in the mountainous districts.
单项选择题 After we had been in the village for a few months, we so liked it that we decided to settle there().