—I hate vegetables. I __________ eat them.
—But they are good for your health! You should eat them every day.
A:always
B:seldom
C:often
D:usually
月球是地球的卫星,在地球上我们总是只能看到月球的一面,是因为月球绕地球公转的周期与自转的周期相等,请问登上月球的航天员在月球上看地球,将看到地球( )