We’ve been told the good news, but when and where to go for the exciting paid vacation _______ yet.

A．are not discussed

B．have not been discussed

C．is not being discussed

D．has not been discussed

当总血钙低于哪个数值时即可引起手足搐搦发作

A．1.5mmol/L～1.63mmol/L(6mg/dl～6.5mg/dl)
B．1.63mmol/L～1.75mmol/L(6.5mg/dl～7mg/dl)
C．1.75mmol/L～1.88mmol/L(7mg/dl～7.5mg/dl)
D．1.88mmol/L～2.0mmol/L(7.5mg/dl～8mg/dl)
E．2.0mmol/L～2.13mmol/L(8mg/dl～8.5mg/dl)