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【单选题】
光化学烟雾对机体的主要危害是A.
对眼睛和上呼吸道的刺激作用
B.
神经系统损害
C.
对胃肠道的腐蚀作用
D.
肝肾损害
E.
肝脏损害
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举一反三
【单选题】Why are collective goods easier to provide in small groups than in large groups?
A.
In a small group, the free riding of one member is harder to conceal.
B.
In a small group, the free riding of one member has a smaller impact on the overall collective good.
C.
Small groups tend to have a central authority to enforce rules on members.
D.
Small groups want to cooperate more than large groups.
【单选题】下列关于要约生效时间的叙述不正确的是
A.
要约到达受要约人时生效
B.
要约于作出要约表示时生效
C.
采用数据电文的，以数据电文进入收件人制定特定系统时生效
D.
未指定特定系统的，该数据电文首次进入收件人的任何系统时生效
【判断题】Different small groups can work at different levels, if the teacher groups students according to their language proficiency level.
A.
正确
B.
错误
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