The US infrastructure falls behind many countries of the world because______.
A．the US has a larger and larger population in recent years
B．the US has experienced frequent natural disasters and political turmoil
C．its current infrastructure has already existed over 50 years
D．the quality of its old infrastructure is low

A.
A．the
B.the
C.its
D.the

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判断题
卡尔对人认为适应性行为包括三部分：动机性刺激、激发刺激和做出的反应。()
答案：正确
问答题
It can be inferred from the text that a student is more likely to get higher points in SAT if he/ she______.
A．comes from a rich family
B．studies 10 hours each day
C．makes less than 20,000 each year
D．has a teacher who excels in virtue
A.
A．comes
B.studies
C.makes
D.has