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【单选题】
患有异食癖的儿童有可能缺乏的微量元素是()。A.
铁
B.
锌
C.
碘
D.
镁
E.
猛
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举一反三
【简答题】教育学是研究（）、（）的科学，简言之其研究对象就是（）。
【简答题】教育学的研究对象,简言之就是 ______ 。教育学是研究 ______ ,揭示 ______ 的科学。
【单选题】听力原文：W: I haven't seen you for a while. Have you been away? M: Yes, I just got back from vacation. I took a tour around the Great Lakes. Have you ever been there? W: Oh, yes! When I was young, I lived...
A.
Unites States Canadian agreements.
B.
Unlimited growth in population.
C.
Pollution in the Great Lakes.
D.
The limitea supply of phosphates.
【单选题】听力原文：M: What happened to you? You're so late today. W: The bus I took broke down in front of the hospital and I had to walk from there. Q: Why was the woman so late? (5)
A.
She took somebody to the hospital.
B.
Something went wrong with the bus.
C.
She came on foot instead of taking a bus.
D.
Something prevented her from catching the bus.
【简答题】GIS系统的核心是 。
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