【推荐3】With the availability of easy-to-use at-home kits, DNA testing for dogs has become increasingly popular among dog owners in recent years. It can provide invaluable insights into a dog’s breed, health risks, and even behaviors.

DNA testing typically works by analyzing the genetic material found in a sample of cells taken from the inside of your dog’s cheek. This sample is then compared to a database of known breeds and genetic markers associated with certain traits or health conditions.

The first step in obtaining a DNA test kit is selecting which type you want. Most companies offer several different types of tests that vary in cost and complexity. For instance, some tests just analyze your dog’s breed composition, while others can assess additional genetic markers associated with certain diseases or behaviors.

Then it’s time to collect your dog’s sample using the provided swab (拭子) kit or saliva-collection tube included with most kits. The swab should be gently rubbed inside your pet’s cheek according to the kit’s directions before being placed into the collection container provided by the company. After collecting the sample, it should be mailed back to the laboratory for processing according to instructions given by the company providing the service. Once received by the lab, it typically takes 1-2 weeks for results to be processed and sent back via email or mail. Results will vary depending on which type of test was purchased, but they generally include detailed information about your pet’s breed composition as well as any potential health risks or behavioral traits associated with their genetics that could affect their overall well-being and quality of life.

If you’re looking for an easy way to learn more about your pup’s background without spending too much money, then DNA testing might just be right up your alley.

1. What is the primary purpose of DNA testing for dogs?

A．To identify a dog’s personality traits.

B．To reveal a dog’s future behavioral changes.

C．To determine a dog’s socialization preferences.

D．To obtain a dog’s breed and genetic information.

2. How does DNA testing for dogs typically work?

A．By analyzing the dog’s hair and fur.

B．By conducting a blood test on the dog.

C．By matching the dog’s DNA with a database.

D．By studying the dog’s genetic health history.

3. What is the correct order of having an DNA test?
①get the sample processed     ②rub the swab gently               ③receive the result   
④select the type of test        ⑤place the swab into the container   ⑥mail the sample back to the lab

A．④-②-⑤-⑥-①-③	B．④ ⑤-①-②-⑥-③
C．②-⑤-④-①-⑥-③	D．②-④-⑤-⑥-①-③

4. What is the text?

A．A dog advertisement.	B．A dog DNA experiment.
C．A dog DNA testing survey.	D．A dog DNA test kit promotion.

【推荐3】Finding perfect places for launching

The Shenzhou XIV crew members began their six-month mission on June 5. When the crews mission finishes around the end of 2022, the Tiangong space station will be fully operational, according to China Daily.

Developments have been made not only in space, but also on Earth. There are currently six satellite launch sites in China, including Jiuquan Satellite Launch Center in Gansu, Xichang Satellite Launch Center in Sichuan, Taiyuan Satellite Launch Center in Shanxi and Wenchang. Spacecraft Launch Site in Hainan ;and two newly constructed ones:China Oriental Spaceport in Shandong and Xiangshan Satellite Launch Center in Zhejiang. How are the launch sites chosen? Several factors are taken into consideration.

Site location

Launching a spacecraft should consider the Earth’s rotation (自转). The lower the latitude (纬度), the faster the Earth’s rotation. If the satellite’s orbit is in the same direction as the Earth’s rotation, a lower latitude adds to the speed when the satellite is launched, leading to lower fuel costs. Experts claim that if a satellite is launched at the equator, where the Earth’s rotation is the fastest, the fuel usage can be reduced by 5 percent.

Weather conditions

Imagine launching a rocket on a stormy day doesn’t seem possible, does it? The sites require a stable climate with low temperature fluctuations (波动). If the local climate varies dramatically, it is more difficult for scientists to monitor the spacecraft and perform experiments. A stable climate could also reduce variations of experiments since the weather has little effect on the tests. For example, Jiuquan Satellite Launch-Center has perfect weather conditions. Being dry and warm, the site is suitable for launches nearly 300 days a year.

Transportation factors

An ideal launch site should be located in a large space with a small population. But the launch site cannot be located in the middle of nowhere. Launch activities require a big amount of material. Therefore, the site needs to be close enough to transportation infrastructure, such as ports, rails and roads. Wenchang Spacecraft Launch Site was constructed near coastal ports, which allows access-to-transportation.

1. According to the text, where is the most fuel-efficient place for launching satellites?

A．Xiangshan Satellite Launch Center.

B．Wenchang Satellite Launch Site.

C．Xichang Satellite Launch Center.

D．Taiyuan Satellite Launch Center.

2. What makes the Jiuquan Satellite Launch Center an ideal place for launching satellites?

A．It lies at a relatively low latitude.

B．It is wet and warm throughout the year.

C．There are clear temperature fluctuations day and night.

D．The local climate is nearly steady all year round.

3. Why was Wenchang chosen as a Spacecraft Launch Site?

A．It enjoys access to marine transportation.

B．It is near many research centers.

C．It can provide labor and natural resources.

D．It is located in the middle of nowhere.