题目

Directions: For each blank in thefollowing passage there are four words or phrases marked A, B, C and D. Fill ineach blank with the word or phrase that best fits the context.The term staycation means vacations that you take at home ornear your home rather than traveling to another place. It is closely connectedwith less pollution, saving money and not contributing to the overwhelmingdisorder that takes place in some of the world's most touristic areas. The concept of staycation was born at thetime of the 2008 market1in the United States. Because of it,many households were forced to2their expen下列不属于扁形动物所具有的特点是（ ）A. 身体背腹扁平B. 身体呈两侧对称C. 有口无肛门D. 都生活在水中