题干
Travelers ______ that they should bring their ID cards with them.
A：have reminded
B：are reminded
C：were reminded
D：had been reminded
答案(点此获取答案解析）
B
Travelers ______ that they should bring their ID cards with them.
A：have reminded
B：are reminded
C：were reminded
D：had been reminded
上点M(
，
)的切线倾斜角是 ( )