题目

—Dear, what about going to the beaches for vacation? —Great! _______we’re lying on the beach in the sun, enjoying music. It must be great fun!A. Pretend                        B. Promise                   C. Mention                   D. Imagine 答案：D   一个四分体的DNA分子数为（ ）A．1个 B．2个C．4个 D．8个