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事务T1，T2，T3分别对数据D1，D2，D3并发操作如下图所示，其中T1与T2间的并发操作存在的问题是 (1) 。T2与T3间的并发操作存在的问题是 (2) 。时间T1T2T3t1t2t3t4t5t6t7t8t9t10t11t12t13t14t15读D1=50读D2=100读D3=300x1=D1+D2+D3读D1=50读D2=200读D3=300x1=D1+D2+D3验证不对读D2=100读D3=300D2=D3-D2写D2读D2=100D2=D2+50写D2 1.（）

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A 根据下面短文回答下列问题。 Four girls went to school every day by taxi. One day, there was a test (测试) in the morning. The girls didn’t want to take the test, so they decided (决定) to get to school late. "What can we tell the teacher" one of the girls said. They thought for a moment (片刻), and then one of them said, "Let’s tell him that our taxi had a flat tire (车胎气)." "That’s a good idea," the other girls said. They arrived at school an hour later. The test was finished. "Why are you late You missed the test," the teacher asked. "Our taxi had a flat tire," the girls said. The teacher thought for a moment, and then he said, "Sit down, one of you in each corner (角落) of the room." The four girls did this. Then the teacher said, "Write the answer to this question: Which tire was flat\ Why did the girls want to be late for school

A. They did not like school.
B. They had not done their homework.
C. They did not want to take a test.

国际清算银行的宗旨是促进货币金融稳定______

A. 对
B. 错

A 根据下面短文回答下列问题。 Four girls went to school every day by taxi. One day, there was a test (测试) in the morning. The girls didn’t want to take the test, so they decided (决定) to get to school late. "What can we tell the teacher" one of the girls said. They thought for a moment (片刻), and then one of them said, "Let’s tell him that our taxi had a flat tire (车胎气)." "That’s a good idea," the other girls said. They arrived at school an hour later. The test was finished. "Why are you late You missed the test," the teacher asked. "Our taxi had a flat tire," the girls said. The teacher thought for a moment, and then he said, "Sit down, one of you in each corner (角落) of the room." The four girls did this. Then the teacher said, "Write the answer to this question: Which tire was flat\ What did the girls tell the teacher for being late

A. They got up late.
B. They could not get a taxi.
C. Their taxi had a flat tire.

[A] Thank you for(your)calling.[B] Shall we meet at 3:00 at the gate[C] OK, that’s fine．[D] Hi! Can I speak to Tom[E] What’s the time, please[F] Yes, I’ll be free．[G] When and where shall we meet Hello! May I speak to Tom, please