题目

—I want some information on________package tour to Thailand. —OK，it costs $400，including________accommodation. A．/；the                               B．a；an C．the；an                              D．the；/ 答案：D受精的鸟卵和在雌鸟体内开始发育，但鸟卵产出后就暂停发育，原因是外界（    ）A．具有阳光B．具有空气C．温度太低D．温度太高