-Can I smoke here?  

-Sorry. We don't allow________here.  [ ]

A. people smoking              

B. people smoke  

C. to smoke                    

D. smoking

可能发生肩难产的因素，下列哪项正确

A．B超测定胎儿胸径大于胎头双顶径1.3cm

B．B超测定胎儿胸径大于胎头双顶径1.6cm

C．B超测定胎儿胸径大于胎头双顶径1.8cm

D．B超测定胎儿胸围大于头围 1.5cm

E．B超测定胎儿肩围大于头围1.8cm