A client has just expelled a hydatidiform mole. She’s visibly upset over the loss and wants to know when she can try to become pregnant again. Which of the following would be the nurse’s best response

A. "I can see you’re upset. Why don’t we discuss this with you at a later time when you’re feeling better. "
B. "I can see that you’re upset; however, you must wait at least 1 year before becoming pregnant again. "
C. "Let me check with your physician and get you something that will help you relax. "
D. "Pregnancy should be avoided until all of your testing is normal. "

从人们的衣食住行，到探索太空，都离不开材料。下列属于合成材料的是

A．PE塑料

B．铝合金

C．钢筋混凝土

D．陶瓷