Because of their moist skin, common snails are most active in damp weather and at night. When conditions become too dry, the snail will retreat into its shell and seal the entrance with a parchment-like barrier known as an epiphragm. Snails can often be found in this state under rocks in gardens or on a wall in a sheltered corner. When sealed away like this the snail goes into a state of suspended animation and can survive for several months without water.
连连看(下列字母是上文着色单词的解释，但顺序已打乱。请找出正确的对应关系，按数字顺序重新排列字母)
a.推迟,悬,挂,暂停,取消
b.
c.撤退,隐退,向后倾
d.a structure or object that impedes free movement
e.潮湿的,湿润的
参考答案：ecbda
单词释义：
moist: a. 潮湿的,湿润的
retreat: n. 休息寓所,撤退,隐居v. 撤退,隐退,向后倾
parchment: n. 羊皮纸
barrier: n. 界线,屏障,障碍物v. 以屏障隔开
suspend: v. 推迟,悬,挂,暂停,取消vi. 吊,悬浮vt. 悬,挂,吊,暂停,中止