A dozen ideas were considered _______ the chief architect decided on the design of the new buildings

of our school.   [ ]

A. before          

B. whether         

C. unless            

D. because

孕妇发生风疹会通过胎盘导致胎儿宫内感染，最可能发生（）

A．食欲下降

B．胎儿体重减轻

C．致畸

D．脐带绕颈

E．难产