I have called the station and they told me the next train for Chongqing _____at 2:30.

A．will leave

B．left

C．has left

D．leaves

患者女性，26岁，平素月经规律，月经周期30天，经期3天。现已停经10周，自觉 * * 触痛明显。

为进一步明确其是否怀孕，应做下列哪项检查

A．胎心音
B．胎动
C．放射检查脊柱轮廓
D．B超
E．以上均不是