2 . As reported in the journal Nature, one system can directly remove carbon dioxide from sources ranging from flue gas (烟道气) to the atmosphere by using electricity to induce a water-and-oxygen-based electrochemical reaction. This technological achievement could turn direct air capture (捕获) from edge industry into a promising front for climate change relief.

Most carbon-capture systems involve a two-step process: First, high-pH liquids are used to separate the carbon dioxide, which is acidic, from mixed-gas streams such as flue gas. Next, the carbon dioxide is regenerated from the solution through heating or by injecting a low-pH liquid.

“Once the carbon dioxide is trapped in these solvents (溶剂), you have to regenerate it,” says Haotian Wang, assistant professor at Rice University. “There are literally no chemicals produced or consumed with our process. We also don’t need to heat up or pressurize our device, we just need to put it into a power outlet and it will work.”

Another drawback of current carbon-capture technologies is their reliance on large-scale, centralized infrastructure. By contrast, the system developed in the Wang lab is an extensible, modular, point-of-use concept that can adapt to a variety of scenarios. “The technology can be scaled up to industrial settings-power plants, chemical plants-but the great thing about it is that it allows for small-scale use as well: I can even use it in my office.” Wang says.

Also the reactor can continuously remove carbon dioxide from a simulated (模拟的) flue gas with efficiency above 98% using a relatively low electricity input. Wang notes that the process has “no carbon footprint or a very limited footprint” if powered by electricity from renewable sources such as solar or wind. “This is great news considering that renewablel electricity is becoming more and more cost-effective,” Wang says.

3 . Around 3,500 Americans ingest (摄入) batteries every year. It’s apparently such a repeating issue that even a specific hotline was built in the event of such an emergency.

And while it’s unlikely your wristwatch’s power source will ever be safe to eat, that doesn’t mean all batteries will remain uneatable-in fact, some are being designed with digestion specifically in mind.

A team of researchers at the Italian Institute of Technology recently revealed what isl being called as the world’s first fully rechargeable, eatable battery. As detailed in a paper published with Advanced Materials, the new device has made good use of some eatable materials.

“Eatable electronic devices will have major implications for gastrointestinal tract (胃肠道) monitoring, treatment, as well as rapid food quality monitoring,” reads the paper’s abstract, adding that although recent research proved the feasibility of eatable sensors and circuits, “fully eatable electronic devices and eatable power sources are still required, of which there have been very few examples.”

According to the team’s findings, their proof-of-concept battery was capable of producing 0.65 volts, which is safely low enough for the human body to handle. The ingestible could provide 48 μA of current for 12 minutes, or alternatively, a few microamps (微安) for over an hour. Such a power supply could provide enough energy for small electronics alike to eatable pill-shaped modules and other gastrointestinal procedure alternatives.

In a statement, researcher coordinator Mario Caironi explained that such a product could help power monitors for both human health conditions and food storage. Additionally, given their safety, products with stronger power could be used within children’s toys, where ingestion risk is higher.

In the team’s statement, co-author Ivan Ilic also explained that despite the battery’s relatively low power, its digestibility provides a promising example of a battery that doesn’t use any harmful materials.

Jiang Zhirong, 22, is from Yingcheng, Hubei Province. Last year, she passed the examination for upgrading from a junior college student to a university student, and     1     (admit) as an undergraduate at Hubei Minzu University.

As she was the only one in her class     2     succeeded in passing the exam, Jiang’s teacher and classmates advised her not to suspend her schooling, but she was     3     (determine) because she “wanted to give back to society”.

As a member of the Plan of the 2022 College Students Volunteer Service to Western Regions, Jiang has now worked in Hubei’s Laifeng County, at the junction (交界处) of three     4     (province), Hubei, Hunan and Chongqing.

In the     5     (two) year of her junior high school studies, Jiang’s father passed away. Her mother was unable to take care of herself because she suffered from     6     illness and her grandmother later succumbed (被压垮) to Alzheimer’s.

    7     (help) Jiang’s family, the local government helped rebuild their house. A kind-hearted man called Nie Chunhua gave support towards Jiang’s mother living in a welfare home.     8     a heart full of gratitude, Jiang studied very hard in technical secondary school and college, until she passed the undergraduate upgrading exam and suspended her schooling.

Speaking of her     9     (decide), Jiang said, “When I was asked whether I would regret     10     (suspend) school to volunteer in the western regions, I was certain I would never.”

6 . Christmastime is generally thought of as joyful. But 40 years ago, it was a ______ time for my wife, Geri, and me. Both of us were about to lose our ______. I was an educator and Geri was a psychologist. To make matters ______, we had loans (贷款) on two houses-at a time when interest rates hovered (徘徊) at 16%. We wanted to ______ one of our houses, but the sale ______ at the last minute.

A place to call ______ looked extremely hopeless for us. Yet we ______ to celebrate Christmas in our new house before we faced the terrible ______ of becoming homeless. So we did something crazy: We ______ a Christmas tree.

It was an artificial tree—the ______ we could find at the local store. I ______ we spent just $11 or $12 on it. It looked ______ with nothing on it, which is only what you would expect from such an inexpensive ______. But it didn’t look half bad when it was fully ______.

Perhaps it gave us good ______. Our job situation turned around, making it ______ for us to keep our new house after all. We ______ put up the tree every year. Friends have advised us to ______ it. But our daughters, who know its ______, insist that we keep it.

Today, the tree is a reminder of our ______ beginnings in our present home-the same one where it first stood up 40 years ago.