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【单选题】
The first speaker of this meeting is ______.A.
Dr Scott Macleod
B.
Dr. Chen Zhili
C.
Mary Smith
D.
Dr. Saul Lloy
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举一反三
【简答题】The two universities signed an agreement.under which they would exchange students and scholars.
【单选题】What does the new study by the two universities say about recent crop improvement efforts?
A.
They fail to produce the same remarkable results as before the 1980s.
B.
They contribute a lot to the improvement of human food production.
C.
They play a major role in guaranteeing the food security of the world.
D.
They focus more on the increase of animal feed than human food grains.
【单选题】下列关于原电池的叙述，正确的是（ ）①构成原电池的正极和负极必须是两种不同的金属；②原电池是化学能转变为电能的装置；③在原电池中，电子流入的一极是正极，该电极被还原；④原电池放电时，电流的方向是从负极到正极；⑤原电池工作时，溶液中的阳离子向负极移动；⑥电子经溶液从负极流向正极
A.
① ② ⑥
B.
② ③
C.
②
D.
② ⑥
【单选题】下列关于原电池的叙述，正确的是（ ）①构成原电池的正极和负极必须是两种不同的金属；②原电池是化学能转变为电能的装置；③在原电池中，电子流入的一极是正极，该电极发生还原反应；④原电池放电时，电流的方向是从负极到正极；⑤原电池工作时，溶液中的阳离子向负极移动；⑥电子经溶液从负极流向正极
A.
① ② ⑥
B.
② ③
C.
②
D.
② ⑥
【单选题】在原电池构成的闭合回路中，关于电子和阴、阳离子运动方向的描述正确( )
A.
电子从原电池的负极通过导线移动向正极
B.
电子从原电池的正极通过导线移动向负极
C.
阴离子在电解质溶液中向正极移动
D.
阳离子在电解质溶液中向负极移动
【简答题】Why are the two universities important?
【多选题】Select the two universities related to missionaries originally
A.
Peking University
B.
Beijing Normal University
C.
Renmin University
D.
China University of Political Science and Law
【单选题】What does the new study by the two universities say about recent crop improvement efforts?
A.
They fail to produce the same remarkable results as before the 1980s.
B.
They contribute a lot to the improvement of human food production.
C.
They play a major role in guaranteeing the food security of the world.
D.
They focus more on the increase of animal feed than human food grains.
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【简答题】The two universities signed an agreement.under which they would exchange students and scholars.
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