党的十九大报告提出“坚持和平发展道路，推动构建人类命运共同体”，这表明中国对外工作有了新的目标。()
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当前，世界面临的不稳定性不确定性突出，人类面临许多共同挑战。()
二十国集团是发达国家和发展中国家就国际经济事务进行充分协商的重要平台。()
Which of the following factors affecting the reaction of Mg and H2O was studied in Experiment1, but not inExperiments2 or 3？
A. Reaction temperature
B. Addition of NaCl
C. Addition of Fe
D. Surface area of Mg
What was the problem with the air conditioning Mr. Henry purchased？
A. The air conditioning filter wasn"t replaced.
B. The thermostat was turned down too low.
C. The freon pressure was lower than normal.
D. The fan motor was out of order.
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