1. (2022高三下·哈尔滨模拟) 阅读下列短文，从每题所给的四个选项（A,B,C 和 D）中，选出最佳选项。

After winning the bid to host the 2022 Winter Olympics, China has been striving to hold a high-tech Winter Games. Now, as the games are approaching, the viewers can learn how innovative technologies are being used, especially in the construction of venues.

For example, how the National Aquatics Center, also known as the "Water Cube", was turned into the "Ice Cube". The main change is to turn the four-lane swimming pool into a curling rink (冰场). According to Xinhua, the "transformation" will be completed by using a quick-disassembly (快速拆除的) system. Simply put, the water will be drained(抽干) from the pool and then a convertible (可移动的) frame will be built and put inside. The frame is made up of 2,600 H-shape steel columns and has a height of three meters and a length of two meters, China News Service reported.

Another major technology applied can be seen at the National Speed Skating Oval(NSSO), known as the "Ice Ribbon".Traditionally, freon, which harms the ozone layer, was used in the ice-making process. But NSSO adopts an environmentally friendly technology, which uses carbon dioxide to make ice.

For another new venue, the National Sliding Center, the design team was confronted with a tricky problem. The center features a 1.9m sliding track. The center is located on the southern slope of Xiaohaituo Mountain in Yanqing. The sunlight in the southern slope is stronger than that in the northern slope. What's more the Yanqing competition zone has complex terrain (地形) and strong wind," Li Bo, a professor at Beijing Jiaotong University, told CGTN." Wind resistance is the key to the construction of buildings," Li added.

So they studied the wind filed date in the zone, analyzed the sun's height in different seasons, and used computer models to simulate (模拟) and determine the awning (遮阳篷) coverage on the track. Finally, the team developed a system combining the terrain and awning to reduce the impact of solar radiation.

1. （1） What's the meaning of the underlined word "striving" in paragraph 1_______?

   A . fighting bravely B . criticizing severely C . working hard D . thinking highly
3. （2） What can learn about the frame used to transform the "Water Cube" into the "Ice Cube"

   A . It is as long as three meters. B . It is in the shape of letter A C . It can be taken apart easily. D . It can turn water into ice automatically.
5. （3） What is the benefit of the technology used to build the National Sliding Center?

   A . It can cut carbon emissions significantly. B . It can absorb harmful chemicals freon releases. C . It helps athletes quickly familiarize themselves with the complex terrain. D . It can reduce the impact of strong wind and solar radiation.
7. （4） What is the text mainly about?

   A . A comparison of some Beijing Winter Olympic venues. B . Technologies used to build the Beijing Winter Olympic venues. C . China's mission of holding the Beijing Winter Olympics. D . The difficulties of venue transformation for the Beijing Winter Olympics.