引起产后出血的原因主要有______、______、______、______，以_

In the early hours of March 8, a Boeing 777 took off from Kuala Lumpur, Malaysia. Its destination was Beijing. But for unknown reasons, it never arrived there.

There were 239 people on the Malaysia Airlines flight, including 154 Chinese. As of March 13, 12 different countries, including Malaysia, China, Vietnam and the US, were searching for the plane.

The disappearance is an “aviation (航空) mystery”, Azharuddin Abdul Rahman, the head of Malaysia’s Civil Aviation Authority, said on March 10.There was no clear sign of a crash by March 13.

Between 1-2 hours after takeoff, the plane suddenly lost contact with people on the ground. The weather was clear, and the pilots didn’t make any calls . No evidence was found in the area where the flight last made contact. People are also talking about a possible hijacking (劫机).

International police agency Interpol confirmed on March 9 that at least two passengers on the flight had used stolen passports to get on board. “We are looking at all possibilities,” said Malaysian Transport Minister Hishamuddin Hussein. The incident is now being called simply a “plane disappearance”.

So, what are some possible causes of a plane disappearance? An AP story provided a summary.

1. A failure of the plane’s body or its engines. However, even if both engines stopped working, the plane could still glide (滑翔) for up to 20 minutes, giving pilots time to make an emergency call.

2. Bad weather. Planes are designed to fly through most severe storms. However, in June 2009, an Air France flight from Rio de Janeiro to Paris crashed during a bad storm over the Atlantic Ocean.

3. A bomb. Throughout history, several planes have been brought down by bombs.

4. An accidental shoot-down by some country’s military. In July 1988, the US Navy accidentally shot down an Iran Air flight. In September 1983, a Korean Air Lines flight was shot down by a Russian fighter jet.

No matter how unlikely a situation, it’s too early to determine what really happened to MH370. It could take months, if not years, to rule out any possibilities, say experts..

小题1:How many cities are mentioned in this passage?

A．Four cities.

B．five cities.

C．Six cities.

D．Seven cities.小题2:What could the underlined phrase “rule out” in the last paragraph mean?

A．cross out

B．get rid of

C．take out

D．take the place of小题3:What could be the best title of the passage?

A．An Air Crash

B．The Causes of the Disappearance

C．The Disappearance of MH 370

D．An Aviation Mystery

温带草原在半湿润区的群落类型是( )

A．草甸草原
B．典型草原
C．荒漠草原
D．高山草甸

泰国近几个月来激烈的政治斗争受到了全球的关注。2008年12月17日，泰国国王普密蓬签署御令，批准由议会选出的新 * * 阿披实就任泰国第二十七任 * * 。对于阿披实来说，就任 * * 可能是他一生的最高荣耀，但对于81岁高龄的普密蓬国王来说，这并不算什么。因为普密蓬国王在位已62年，是当今世界上在位时间最长的君主，他已经历过20次军事 * * 、27任 * * 和50多届内阁。

根据材料请回答：

（1）泰国实行什么类型的政体？

________________________________________________________________________________________________________________________________________________________________

（2）简要说明这一政体的主要特点。

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在存在潜在利益冲突的情形下，应当向所在机构管理层主动说明利益冲突的情况，以及处理利益冲突的建议。( )

掘进机掘成巷道的合格标准，宽度误差为（）。

A、-50～+200mm；

B、-30～+200mm；

C、-50～+250mm；