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【单选题】
《高速公路收费服务标准化手册》中对“入口发卡”规定如下：送车道内无等待车辆，收费员目送车辆离开（），若车道内有等待车辆，则进入下一辆车的操作。A.
车头与亭窗相错处
B.
车辆与亭窗相错处
C.
车头驶至自动栏杆处
D.
车头驶至安全岛头处
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举一反三
【简答题】挫折-攻击理论是（）提出的。
【单选题】One reason for quick population increase in underdeveloped countries is that ______.
A.
improved public health standards have reduced death rate greatly
B.
people can get government support if they have more kids
C.
those countries encourage people to have large families
D.
those countries have enough resources to support a large population
【单选题】Which of the following is among the benefits of learning an instrument for children?
A.
Improving behaviors and relieving stress.
B.
Promoting growth and improving intelligence.
C.
Boosting confidence and improving intelligence.
D.
Improving intelligence and strengthening memories.
【简答题】在特定的环境条件下重复出现的杂草种群组合,称为()。
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