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【单选题】
疯牛病的病原体是一种 。A.
病毒
B.
朊病毒
C.
霉菌
D.
细菌
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【单选题】听力原文：New York City: The United States National Weather Service says that the huge winter storm has dumped some 68.3 centimeters of snow in Central Park, making it the worst blizzard to hit New York Ci...
A.
Blizzard.
B.
Airplane crash.
C.
Heavy rain.
D.
Tsunami.
【简答题】Most young people enjoy some form of physical activity. It may be walking, cycling or swimming, winter skating or skiing in winter. It may be a of some kind, football, hockey, golf or tennis. It ...
【简答题】Look and write. 看一看，写一写。 1. _pple h t nt 2. tea er air pea 3. eras mark wint 4. sch l z r ster 5. ch k w k ...
【简答题】When did you last see a polar bear? On a trip to a zoo,perhaps? If you had attended a winter activity in New York a few years ago, you would have seen a whole polar bear club. These”Polar Bears” are p...
【简答题】提升旅游者文明行为的途径有哪些?
【简答题】酵母菌无性繁殖方式有 、 、 ,以产 方式进行有性繁殖。
【简答题】异丙苯在催化剂上脱烷基生成苯,如催化剂为球形,密度为 ρ P = 106 0 kg·m -3 ,空隙率 ε P =0.52 ,比表面积为 S g =350m 2 g -1 ,求在 500°C 和 101.33kPa ,异丙苯在微孔中的有效扩散系数,设催化剂的曲折因子 τ =3 ,异丙苯 − 苯的分子扩散系数 D AB =0.155cm 2 s -1 。
【单选题】下列四个命题中真命题是（ ）
A.
同垂直于一直线的两条直线互相平行
B.
过空间任一点与两条异面直线都垂直的直线有且只有一条
C.
底面各边相等、侧面都是矩形的四棱柱是正四棱柱
D.
过球面上任意两点的大圆有且只有一个
【简答题】阅读理解。 What's the coolest kind of transportation (交通) for middle school students back from winter holidays? A racing bike? A car? No, it's a special kind of shoes called Heelys (暴走鞋). Heelys look just ...
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