太阳系各行星几乎在同一平面内沿同一方向绕太阳做圆周运动。当地球恰好运行到某地外行星和太阳之间,且三者几乎排成一条直线的现象,天文学中称为“行星冲日”。假定有两个地外行星A和B,地球公转周期T0=1年,公转轨道半径为,A行星公转周期TA=2年, B行星公转轨道半径,则A.相邻两次A星冲日间隔为2年B.相邻两次B星冲日间隔为8年C.相邻两次A星冲日间隔时间比相邻两次B星冲日间隔时间长D.相邻两次A、B两星同时冲日时间间隔为8年
There is little money for Mr. Lee to buy a ticket for today's show, ____ ?
Exactly!( )
are there
isn't there
aren't there
is there
Only You is a TV program ____ is popular with most young people.
Yes, it is definitely true.( )
that
whose
what
who
Look! The man welcoming us at the school gate ____ be our headmaster.
No,it ____ be him.He is having a meeting in the office now.( )
must; can't
must; mustn't
can't; mustn't
mustn't; can
The weather report says that it ____ tomorrow in most parts of Anshun city.
If it ____ , the school sports meet will be canceled.( )
will rain; will rain
will rain; rains
rains; will rain
rains; rains
The number of the elderly(老人) ____ increasing in China, and with the development of China's economy,they ____ better care of in the future.( )
is; will take
are; are taken
is; will be taken
are; will take