The China Manned Space Agency (CMSA) announced on April 16 that the Shenzhou-13 return capsule
The Shenzhou-13 manned spacecraft
The complete success of the Shenzhou-13 manned mission marks the completion of the key technology verification stage of the China Space Station,
8 . How Old Mascara Wands Can Help Wildlife
When injured and orphaned animals are found by wildlife rehabbers (野生动物康复者), they often need baths and can be covered in all sorts of unwanted pests. Opossums, squirrels, rabbits, and owls all need lots of care.
One refuge (庇护所) in North Carolina found an innovative way to use discarded mascara wands (丢弃的睫毛膏刷棒) to clean the coats of these rescued animals.
Appalachian Wildlife Refuge, a nonprofit wildlife sanctuary (庇护所) in North Carolina, began asking people to donate used mascara wands so they can be used to help care for animals. And a nonprofit “Wands for Wildlife” took off in 2017 when wildlife rehabilitator and the refuge's co-founder Savannah Trantham posted on her Facebook page asking for used wands. “Did you know something as simple as an old mascara wand can help wildlife?
If you'd like to donate, clean old mascara wands in warm, soapy water, then mail them to “Wands for Wildlife”.
| A．We use mascara brushes to help remove fly eggs and bugs from the fur of the rescued animals |
| B．The post was shared tens of thousands of times |
| C．It can be painstaking to pick fly eggs and bugs out of the coats of tiny animals as they're being bathed |
| D．The refuge immediately received package after package filled with wands |
| E．If you don't have mascara wands, the refuge asks that you don't buy news ones |
| F．By collecting used wands, we extend the life of a disposable plastic item |
| G．Because the wands make quick work of the task plus it repurposes an item that would've ended up in a landfill |
9 . Commercial planes could soon mimic migrating birds by traveling together, with one airliner following close behind the other to gain some free lift. European manufacturing giant Airbus says this project, called fello’ fly, could reduce the follower aircraft’s fuel requirements by up to 10 percent per trip.
Fello’ fly was inspired by the way some birds, typically geese, often fly in formation (编队) to save energy. Like a bird, a moving airplane leaves a wake of disturbed air behind as its wings produce swirling vortices (气旋). These vortices move in a circular motion and expand outward until they disappear, creating an updraft (上升气流) around the wake. If a second aircraft follows the leader at a specific distance and slightly away from the center of the wake, this updraft provides extra lift.
Such a boost allows the follower to cut down on engine thrust, fuel use and emissions. But to reap these benefits, airliners have to position themselves carefully: if the follower gets too close to the center of the leader’s path, the vortices will actually push it downward instead of up.
Aircraft flying so close would need to coordinate (协调) carefully to prevent accidents, and this coordination would need to start on the ground. Airline pilot David Mrak, who is not involved in the fello’fly project, says challenges would likely include setting rules of engagement between the two planes, deciding on the role of air traffic controllers, maintaining communication between all parties involved, creating plans to deal with emergency situations or bad weather, and splitting the economic benefits.
Although the minimal separation might sound potentially dangerous, Mrak suggests that operating planes so near each other may not be out of the question. “As pilots, we undergo extensive training,” he says. “Flying aircraft in formation is a matter of proper training procedures.”
Mrak estimates that if the system works, “it could potentially save the airlines thousands of pounds of fuel per transatlantic trip.” And according to Airbus, every metric ton of fuel saved means roughly three metric tons less carbon dioxide emitted.
1. Which one of the following is closest in meaning to the underlined word “mimic”?| A．support | B．imitate | C．approach | D．discover |
| A．Because it can help save fuel for the two aircraft. |
| B．Because it can eliminate accidents caused by birds. |
| C．Because it can improve air safety for passengers. |
| D．Because it can reduce greenhouse gas emissions. |
| A．maintaining an appropriate distance between the two flights |
| B．figuring out how to handle emergency situations |
| C．deciding on the proper height of the follower flight |
| D．coordinating communication between all sides |
| A．Disapproving. | B．Skeptical. | C．Optimistic. | D．Uninterested. |
10 . Costa Rica has a long-standing commitment (投入) to the environment.
In the 1940s, more than three-quarters of the country was covered in mostly rainforests and other woodlands. Then, between the 1940s and 1980s, heavy, uncontrolled logging (伐木) led to serious deforestation (滥伐).
Robert Blasiak, a researcher at the University of Tokyo, said, “Taking a closer look at what Costa Rica has achieved in the past 30 years may be just the driving force needed to make real change all over the world.”
That is exactly what the Costa Rican leaders hope to achieve.
| A．That is exactly what we’ve been doing. |
| B．By 1983, only 26% of the country had forest cover. |
| C．It has dealt with the problem of deforestation effectively. |
| D．They want to encourage other nations to follow their example. |
| E．It is not just advanced for its time but is also incomparable in the world. |
| F．These payments are funded by the country and through international donations. |
| G．The country has established programs for landowners taking part in reforestation. |
