— I like traveling alone.
A:No problem.
B:It's up to you.
C:Not much.
D:I don't agree with you.
小钟同学仔细观察佛像,发现佛祖的衣着是热带的风格,这是因为佛教来源于( )。
若椭圆的短轴为AB,它的一个焦点为F1,则满足△ABF1为等边三角形的椭圆的离心率是( )
When people ______, they take air into their lungs (肺部) and let it out again.