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    Yesterday the police were joined by more Yesterday the police were joined by more than 20 volunteers in the

continuing search for the two missing teenagers, Vicky Gray and Tom Hunter, and their guide, Gavin Jones. The

police said that they had disappeared during an adventure (冒险) tour of Cape York Peninsula.

    This was the second day of the search and the police were now very worried about the safety of the three

missing people.

    The police said that the search had covered a wide area, but the rainforest was thick and their work was

made harder by the recent rain. Later on Chief Inspector (警官) Roger Fleet said, "The travellers had a ridio

with them. If they had been in trouble, they would have called us." 

    The three travellers left Cooktown very early on Saturday morning in a Toyota car. They took a small dirt

road that runs down to the Daintree River, a dangerous river full of crocodiles (鳄鱼). Chief Inspector Roger

Fleet said the tourists wouldn't have got into trouble if they had stayed on the main road.

    A photo of Vicky and Tom was found by a policeman under the "Be Careful about crocodiles" sign near the

river. Why was the photo left behind? This is just one of the unanswered questions. Other questions are: Why

was the photo left behind? Why was the Toyota parked and locked at the edge of the rainforest? The police said

that the travellers had left a map of the area behind. Why? Why had someone drawn a cross on the point (地点)

where the car is? Is this a sign? What does it mean? If anyone can give information or has seen these three

young people, contact the local police in Cooktown.

1. This article is probably taken from ________. [ ]

A. a newspaper

B. a magazine

C. a storybook

D. a guidebook

2. Which word best describes the search of the three missing people? [ ]

A. Helpless

B. Hard

C. Delightful

D. Successful

3. Which of the following things wasn't found by the police? [ ]

A. A touring map.

B. A photo of the travellers.

C. The travellers' radio.

D. The travellers' car

4. All the following are unanswered questions except ________. [ ]

A. why they left a photo behind

B. why they came to this area

C. why their Toyota was parked in the place

D. why a cross was drawn on the map

5. The article asks people to ________. [ ]

A. join the police in searching for the missing people

B. tell the police about the travellers' ages and their appearance

C. learn the lesson and stop taking adventure tours

D. provide information about the missing people

下列关于匀速直线运动的x一t图象、v一t图象的说法正确的有(    )

A．x一t图象表示物体运动的轨迹，v一t图象不表示物体运动的轨迹

B．在x一t图象中不能表示出物体速度的大小

C．在x一t图象中可以表示出物体速度的大小和某段时间t内的位移

D．x一t图象一定经过坐标原点

个人所得税法规定的临时离境是指( )。

A．一次不超过30日

B．一次不超过90日

C．一次不超过30日或多次累计不超过90日

D．多次累计不超过183日

《地面气象测报质量考核办法》规定：气压自记纸的读数误差（）hPa的，算一个错情。

A.≥0.1

B.≥0.3

C.≥0.5

D.≥0.6

如果总增益降低，那么（）

A.施加于患者的能量降低

B.所有回声的强度都降低相同水平

C.探头频率降低

D.仅远场的回声亮度降低

E.分辨力降低