若幂函数f（x）=x^a在（0，+∞）上是增函数，则（　　）

当1 g氨气完全分解为氮气、氢气时，吸收2.72 kJ的热量，则下列热化学方程式正确的是(　　)
①N₂(g)＋3H₂(g)===2NH₃(g)　ΔH＝－92.4 kJ/mol
②N₂(g)＋3H₂(g)===2NH₃(g)　ΔH＝－46.2 kJ/mol
③NH₃(g)===N₂(g)＋H₂(g)　ΔH＝＋46.2 kJ/mol
④2NH₃(g)===N₂(g)＋3H₂(g)　ΔH＝－92.4 kJ/mol

影响亚洲河流流向的主要原因是（     ）  

用最小刻度值是0.1毫米的尺子去测量某钢丝的直径，下面是几个同学的记录，其中有效数字错误的是 （　　）

Several years ago， a television reporter was talking to three of the most important people in America. One was a very rich banker, another owned one of the largest companies in the world, and the third owned many buildings in the center of New York.
The reporter was talking to them about being important. “How do we know if someone is really important?” the reporter asked the banker. The banker thought for a few moments and then said,” I think anybody who is invited to the Whiter House to meet the President of the United States is really important. ”
The reporter then turned to the owner of the very large company. “Do you agree with that?” she asked. The man shook his head, “No. I think the President invites a lot of people to the White House. You’d only be important if while you were visiting the President, there was a telephone call from the president of another country, and the President of the US said he was too busy to answer it. ”
The reporter turned to the third man. “Do you think so?” “No, I don’t.” he said. “I don’t think that makes the visitor important. That makes the President important. ” “Then what would make the visitor important?” the reporter and the other two men asked.
“Oh, I think if the visitor to the White House was talking to the President and the phone rang, and the President picked up the receiver, listened and then said, “It’s for you.”
【小题1】There are _______ in this passage.

A．two men and two women	B．three men and one woman
C．three women and one man	D．four women

【小题2】The banker thought _______.

A．he was really important because he was a rich banker

B．the visitor to the White House was really important

C．the visitor who met the President of the United States

D．the reporter was really important

【小题3】 The owner of many buildings thought _______.

A．he was really important because he owned many buildings in the center of New York

B．the owner of the very large company was really important

C．the visitor was really important if he was talking to the President and the President received a telephone call for the visitor

D．the person who worked in the White House was really important