| A．in case | B．even if | C．as though | D．so that |
| A．tale | B．circuit | C．mixture | D．bond |
| A．detect | B．guarantee | C．cheat | D．assign |
| A．A modern factory. | B．A new theatre. | C．A huge tower. |
| A．It was rebuilt. | B．It was torn down. | C．It was changed into a park. |
| A．Pleased. | B．Bored. | C．Disappointed. |
Since I was born and brought up in a rural town, I have a great interest in nature. Using the chance of studying abroad in my second year at college, I decided to go to Canada just because I wanted to see the beautiful phenomena there. So after I finished the study, I went to Yellowknife in the Northwest. I clearly remember the sixth night in Yellowknife. Suddenly my host mother came to my room around 8 p. m. and told me to change clothes and go outside quickly carrying her camera.
The northern lights were flickering (闪烁)in the sky! I was amazed and just stood there with my mouth open. I forgot to take pictures of the mysterious lights.
Since that night, whenever it was sunny, I went outside at night and looked at the sky. It was so cold that my hands and feet were numb with cold. Actually, the time of my being able to be out was limited. I had to bring her camera back to the house in one hour at the most, for the camera was going to be broken because of the cold temperature.
As I took pictures of the northern lights, I came to find a characteristic movement of the lights. They first appear in the north part of the sky and then they gradually come down to the south. After that, suddenly, they come in the middle of the north and south only for a while, which is the time when the best northern lights can be seen. Since it is only a few seconds for the northern lights to come down to the middle of the sky, it is very hard to get good pictures.
The stronger the sun acts, the better and stronger northern lights flicker in the sky. That’s because they occur from the collision(碰撞)between atmospheric gases and solar wind. Much more solar wind comes to the earth when the sun is active, leading to the best northern lights.
1．Why did the author forget to take pictures?| A．It was freezing cold outside. |
| B．He was shocked by the wonderful sights. |
| C．The lights were flickering in the sky. |
| D．He lost all his feeling in his hands and feet. |
| A．The northern lights came out every night. |
| B．The author took lots of pictures with his camera. |
| C．The author could stay as long as he liked outdoors. |
| D．Cameras will be damaged if exposed too long to coldness. |
| A．They appear in the north part of the sky. |
| B．They rise in the east and set in the west. |
| C．They are between the north and south. |
| D．They come down to the south part of the sky. |
| A．The lights stay in the middle for a very short time. |
| B．The lights of the sun affect the northern lights. |
| C．The lights are caused by the collisions of gases. |
| D．The colours of the lights are determined by the height. |
University of Wisconsin — River Falls
Student Custodian (保管人) Position Description
Title: Student Custodian
Department: Facilities Management
Reports to: Custodial Services Chief
Appointment: Academic Year 2022-2023
Payment: $7. 50 per hour
Position Summary:
The Facilities Management Student Custodian position is an undergraduate student employee working in the academic buildings of campus to assist permanent staff in providing basic custodial duties. This position requires early morning and midmorning hours starting as early as 6:00 a.m.
Responsibilities:
Qualifications and Conditions of Employment:
* Must be enrolled (注册) as a full-time student during the period of employment.
*A grade point average (GPA) of 2.25 or higher before and during employment.
* Must possess the physical and mental strength to perform required work including moving furniture, and work on one’s feet for long periods of time including frequent lifting of up to 50 pounds or more.
*Must attend custodial staff meetings every two weeks.
1．Which of the following describes the position rightly?| A．It is a voluntary job. | B．It is an assistance job. |
| C．It is an afternoon job. | D．It is provided for a graduate student. |
| A．Purchase new furniture. | B．Keep classrooms clean. |
| C．Assist students to do their studies. | D．Provide safety training for students. |
| A．The grade point average should be 2.5 at least. |
| B．Attending staff meetings weekly. |
| C．Having enough strength to move furniture. |
| D．Being enrolled as a full-time teacher. |
UC Berkeley Youth Recreation Summer Camps
UC Berkeley Youth Recreation will provide a wide variety of one-week outdoor experiences and activities for the youth on summer camps 2023. Here are four best summer camps.
Windsurfing Camp
This camp is designed to teach students the basics of windsurfing, including balance and self-rescues. Through a combination of classroom instruction, demonstration and water time campers are able to master the basics of the sport. A comfort with wind and water is strongly encouraged. Campers must be ages 10-17 to register. All campers must be able to swim and weigh 100 pounds or more to safely use public windsurfing equipment.
Price: $330. Those who have participated before can receive 10% off.
Sailing Camp
Campers learn and review the essentials of sailing at their experience level on the beautiful San Francisco Bay! 2023 brings exciting updates to the camp and helps sailors master new skills. Previous sailing experience is required. Campers must be ages 12-18 to register. All campers must have basic swimming skills.
Price: $255
Skateboarding Camp
In this camp, skateboarders will learn mechanics and basic riding skills such as balance riding switches, and dropping-in. Skaters will be assessed of the first day of the session and the lessons will be adapted to their ability. All participants are educated in skateboard safety. Campers must be ages 8-16 to register. Participants must bring their own skateboard, helmet(头盔) and knee &elbow pads(护具).
Price: $300. $240 per person for group registration.
Rock Climbing Camp
Learn climbing skills, knot(结) -tying, top-rope climbing and equipment care. Sites include Strawberry Canyon, Remillard, Indian Rock and Cragmont Parks. Campers must be ages 9-15 to register. All campers can enjoy the bus service to and from the campsites.
Price: $275.
1．What is a must for the participants of Windsurfing Camp?| A．Appropriate weight. |
| B．First aid knowledge. |
| C．Previous learning experience. |
| D．Personal protective equipment. |
| A．It acquires previous skateboarding experience. |
| B．It’ll issue certificates of excellence. |
| C．It gives a 10% discount for group registration. |
| D．It bases its lessons on campers’ levels. |
| A．Windsurfing Camp. | B．Rock Climb. |
| C．Skateboarding Camp. | D．Camp Sailing Camp. |
Scientists in the Netherlands have trained bees to identify COVID-19 through their sense of smell, according to a press release from Wageningen University. The research was conducted on more than 150 bees in Wageningen University’s bio-veterinary research laboratory.
The scientists trained the bees by giving them a treat — a sugar-water solution (溶液) — every time they were exposed to the scent of a mink (貂) infected with COVID-19. Each time the bees were exposed to a non-infected sample, they wouldn’t get a reward. Eventually, the bees could identify an infected sample within a few seconds — and would then stick out their tongues like clockwork to collect the sugar water.
Bees aren’t the first animals to detect COVID-19 by scent. Researchers have also trained dogs to distinguish between positive and negative COVID-19 samples from human saliva (唾液) or sweat with fairly high levels of accuracy. A small German study found that dogs could identify positive COVID-19 samples 94% of the time. That’s because metabolic changes from the coronavirus make an infected person’s bodily fluids smell slightly different from those of a non-infected person. But researchers still aren’t sure whether animals are the best bet (赌注) for sniffing out COVID-19 cases outside the lab.
“No one is saying they can replace a PCR machine, but they could be very promising,” Holger Volk, a neurologist, told Nature. PCR machines are what lab technicians use to process standard COVID-19 swab tests. At the very least, certain animals could be useful for identifying COVID-19 in places or countries in which high-tech laboratory equipment is scarce or inaccessible.
Wageningen scientists are working on a prototype of a machine that could automatically train multiple bees at once. Then bees can use their skills to test for coronavirus aerosols (气溶胶) in the surrounding environment.
1．How did the researchers teach the bees to identify COVID-19?| A．By offering bees some rewards. |
| B．By infecting bees with COVID-19. |
| C．By raising bees with sugar water. |
| D．By exposing bees to infected humans. |
| A．For dogs can sniff out hidden virus of the samples. |
| B．For dogs can tell the different smell of the samples. |
| C．For dogs can feel metabolre changes of the samples. |
| D．For dogs can distinguish saliva from sweat of the samples. |
| A．To breed more multiple bees. | B．To detect coronavirus aerosols. |
| C．To help underdeveloped countries. | D．To develop a new type of machine. |
| A．A New Way to Cure COVID-19 Disease |
| B．Bees: Well-trained COVID-19 Detectors (探测器) |
| C．Bees’ Extremely Accurate Sense of Smell |
| D．The Best Method of Identifying COVID-19 |
| A．By bus. | B．On foot. | C．By taxi. |
| A．Five. | B．Six. | C．Seven. |
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