取铁路罐车或公路罐车均匀样品时，应把取样器降到油罐车罐内油品深度的（）处。
A、1/6
B、1/2
C、5/6
D、任意
参考答案：B
—I missed the beginning of ________musical programme The Voice of China.
—What a pity! You should leave school half _______ hour earlier.
A．a, an
B．the, a
C．the, an
D．an, the
