铁路转弯处常竖立一速度标示牌,即火车以此速度大小行驶时,车轮边缘和内、外侧铁轨均无挤压作用.如果火车转弯时的速度小于标示速度,那么 ( )
Nowadays China has about 25,000 kilometers of high﹣speed railways.
That's ______of the world's total.( )
A.two thirdB.two﹣thirdC.two thirdsD.two three
President Xi Jinping paid______important visit to the US in 2017.
And he was warmly welcomed by Donald Trump,_____45th American president.( )
A.a; theB.an; theC.the; aD.an; a
I wonder______.
I' m not sure yet.( )
A.which is hersB.which hers is
C.Whether is it hersD.whether hers it is
Do you know where the last two pictures went?
A millionaire bought _____of them. He thought they were worth.( )
A.eitherB.eachC.noneD.both
I took the subway and_____at the downtown station.( )
A.got throughB.got over
C.got onD.got off