问题 单项选择题

甲、乙、丙三个观察者,同时观察一个物体的运动。甲说“它在做匀速运动”,乙说“它是静止的”,丙说“它在做加速运动”。则下列说法中正确的是()

A.在任何情况下都不可能出现这种情况

B.如果选同一参考系,那么三人的说法都对

C.三人中总有一人或两人讲错了

D.如果各自选择不同的参考系,那么三人说法都可能对

答案

参考答案:D

解析:运动是相对的,同一个物体的运动相对于不同的参考系描述的时候会得到不同的结果,比如对于静止在地面上的某一物体,相对于匀速运动的甲来说它在做匀速运动,相对于站在地面上的乙来说它是静止的,相对于加速运动的丙来说它也在加速,D正确。

多项选择题
阅读理解

China's relatively poor western regions are to receive 296 billion yuan (about 43.3 billion U.S. dollars) of investment through 551 projects signed with investors from both China and abroad.

Those deals (合同) were sealed at the tenth Western China International Economy and Trade Fair in Chengdu, provincial capital of southwest China’s Sichuan Province.

The region has 12 provinces, autonomous (独立的) regions and municipalities (自治区), with a combined population of about 370 million.

Chinese investors contributed 539 of the 551 projects, involving 288.9 billion yuan of investment. The rest 12 projects would be invested by foreign contractors (承包商), involving in around 1 billion U.S. dollars of investment.

Sectors involving local resources, equipment manufacturing (制造业), service and new and high technology were investors' favorite target areas.

According to agreements signed here, German industrial conglomerate Siemens would spend 30 million yuan in Chengdu to setup a "Global IT Operation Center", intending to provide better IT operation support for its customers.

Meanwhile, Taiwan’s Foxconn Group, the world’s top maker of outsourced electronics, would invest 1 billion dollars to build an industrial base in Chengdu, setting up production lines for products like LED-TV, LCD module (组件), LED backlight module and LCD package. The new base will also develop software and sell 3G digital products as wells.

64. What can we learn from the passage?

A. China’s relatively poor western regions are to receive 296 billion yuan of investment.

B. Those deals were sealed at the eleventh Western China International Economy and Trade Fair.

C. The region has 13 provinces, autonomous regions and municipalities.

D. The region has a combined population of about 310 million.

65. How many projects were signed with investors from both China and abroad?

A. 539.               B. 551.              C. 370.               D. 288.

66. Which of the following is NOT true?

A. 539 projects would be invested by Chinese investors, involving 288.9 billion yuan of investment.

B. Sectors involving local resources, equipment manufacturing ( 制造业), service and old and high technology were investors' favorite target areas.

C. German industrial conglomerate Siemens would spend 30 million yuan in Chengdu to setup a "Global IT Operation Center".

D. 12 projects would be invested by foreign contractors, involving in around 1 billion U. S. dollars of investment.

67. How much money would Taiwan’s Foxconn Group invest?

A. 30 million yuan.                         B. 43.3 billion U.S. dollars.

C. 1 billion dollars.                             D. 2 billion dollars.