公共物品的非排他性和非竞争性决定了人们不用购买仍然可以消费，这种不用购买就可以消费的行为称为（）。
参考答案：搭便车
下列急性化脓性根尖周炎的症状中，哪些叙述是不正确的（）
A.患牙明显伸长
B.自觉持续性跳痛
C.咬紧牙时疼痛暂缓解
D.根尖区红肿、叩痛
E.相应面部反应性水肿
小题1: My ________(第一的)name is Jack. What about yours?
小题2:Sorry, I can’t ________(拼写) the English word. Can you help me?
小题3:Mr. Smith has two __________(女儿). They are both teachers.
小题4: Can you _______(带来) some things to school, Ellen?
小题5: —Let’s play soccer! —That _______(听起来) great!
小题6:Tom ________(观看) TV at home every day.
小题7: What ________(食品) does your mother like?
小题8:I like ___________(草莓) very much. But she doesn’t like them.
小题9: My family and I like __________(运动) after dinner.
小题10:I don’t like tennis. It’s _________(无聊的).
