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【单选题】
Listen to the passage for the first time, focus on the global idea of the passage and then choose the right answers to the questions you hear.音频31.What is America’s challenge in the 21st century according to the passage?A.
Connecting small towns to big cities.
B.
Building the largest transportation network in history.
C.
Maintaining the operation of the transportation network.
D.
Solving the traffic problems in New York.
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【单选题】F-T合成用的催化剂,主要有铁、钴、镍和钌,以下关于F-T合成催化剂叙述错误的是
A.
工业上应用的主要是铁催化剂
B.
具有加氢活性，能形成金属羰基复合物
C.
耐硫能力强，可使用未经脱硫的合成气作为原料
D.
用于流化床反应器工艺的催化剂为熔铁催化剂
【单选题】The house and carriage is a thing of the past. but love and marriage are still with us and still closely interrelated. Most American marriages, 【21】______ first marriages uniting young people, are the...
A.
specially
B.
naturally
C.
particularly
D.
fortunately
【简答题】Do the house and the apartment have air-conditioning? Yes, they _______(do).
【简答题】What do you know about the committees in the House and the Senate?
【单选题】关于F-T合成,下列说法错误的是
A.
是煤间接液化的重要方法
B.
常用催化剂有Fe 、Co、 Mo等
C.
工业化的F-T合成催化剂以Fe系催化剂为主
D.
沉淀铁催化剂活性较低，常用于Arge反应器
【简答题】Students should help their parents to do the dishes and s the path(小路) in front of the house.
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