如图,△ABC内接于⊙O,AD⊥BC于点D,AD=2cm,AB=4cm,AC=3cm,则⊙O的直径是( )
A:2cm
B:4cm
C:6cm
D:8cm
已知偶函数f(x)在0,+∞)上单调递减,且f(﹣2)=0,若f(x﹣2)>0,则x的取值范围是____
Travelling to London
We think ⑴ is the best season to visit England.
We did most of our sightseeing(观光) ⑵ .
The best part of the trip was going to the theatre.
We don't think the English food is very ⑶ .