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"The answer is simple: economics,' Sergey Paltsev, a senior scientist at the MIT Energy Initiative told Popular Science. Politicians and automakers once advocated the fuel cell, which turns the chemical energy of hydrogen into electricity to drive an electric motor, as the future of passenger automobiles, but the falling cost of batteries and a large number of electrical fueling infrastructure (基础设施) have propelled battery-electric cars well into the lead.

A big switch to hydrogen cars would require cost-cutting and enormous infrastructure development. The Department of Energy' s Alternative Fuels Data Center shows 55 public hydrogen fueling station locations in the U. S. today, almost only in California, while more than 68,000 active public electric vehicle charging stations across the country.

"Nothing is going to change next year, or probably not in the next five years, but there are brighter pathways for hydrogen vehicles," said Paltsev. It turns out that hydrogen fuel-cell vehicles have advantageous applications in medium-duty and heavy-duty trucks and aviation (航空). Besides, battery electric vehicles can be problematic when you have problems with range, fueling time or heavy loads.

The current impractical application of hydrogen passenger vehicles in places like the U. S.is not a reason to"just give up" on hydrogen fuel-cell tech. "We may need it for many other reasons in the future," cautioned Paltsev, noting that geopolitical issues could prevent access to raw materials for batteries, thus making hydrogen cars suddenly more economically workable.

"Are you doing that because it's National Stuttering Awareness Day?" I asked with excitement, eager to connect with other stutterers. When he asked how I knew that, I said I grew up with a stutter. He nodded, asking hopefully: "So your stutter has magically disappeared?" I paused. I understood why he assumed this — I sounded quite articulate. But even as we spoke, my stutter had influenced my speech, and that's why I'd misnamed International as National to avoid the tricky front sound that I continue to struggle with.

Though the severity of my stutter has decreased with age, it has shaped my identity and affected my life tremendously, the way that I speak, interact and move around in the world. Some define stutter as a disability because it is as constant and out of control as blindness or other disabilities. There's no pill, no surgery, no way to get rid of it, no "recovering" from it. But there is recovering from the shame and self-hatred that result from it. The treatment for stutter shouldn't be centered around removing a person's stutter, but rather on reducing one's negative thoughts and behaviors surrounding it.

As for me, I'd say that my stutter has not "magically disappeared" because I've simply found ways to conceal it. But I have a better therapy now — I will grow alongside it, an identity inseparable from the way that I speak. Thinking about this, I wanted to speak from the bottom of my heart to the man, who looked at me hopefully: "__________"

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— I understand, but have you tried to ________ ? She's been dealing with family issues.

—It was in a park ________ I came across our old friend Tom yesterday.

The sun was shining brightly during our PE class as we ran laps around the busy sports ground. With laughter and cheers all around me, I took a short break near the field's edge to catch my breath. It was then that I heard a faint mewing sound. Following the sound, I finally spotted a tiny kitten. It looked scared and hurt, its leg twisted at a strange angle.

"Hey, guys! Come here!" I called out to my classmates. They gathered around, their faces filled with concern. "We need to help it," said Sarah. We all agreed. Carefully, I picked up the kitten, feeling its tiny body shake in my hands. It was so small and weak.

We decided to seek help from our kind PE teacher, Mr. Johnson. "Mr. Johnson, we found this poor kitten, and it seems badly hurt," I said, holding it out to him. He looked at the kitten and then at us, a serious expression crossing his face. "Let me call the school nurse Mrs. Thompson," he said.

Before Mrs. Thompson came, we quickly made a makeshift stretcher (临时扭架) using a towel and two sticks, and gently placed the kitten on it with Mr. Johnson's direction. A moment later, Mrs. Thompson came running with a first aid kit. As she examined the kitten, we all held our breath, "It looks like it has a broken leg," she said. "We need to get it to the animal hospital immediately." Mr. Johnson nodded and told us to go back to the classroom after the PE class was over. Then, he and Mrs. Thompson took the kitten to the vet.

The rest of the day was a blur. We could only think about the kitten, hoping it would be fine.

注意：

1.续写词数应为150左右；

2.请按如下格式在答题卡的相应位置作答。

Before the school was over, Mr. Johnson returned to the classroom with a big smile on his face.

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In the animal hospital, we saw the recovered kitten.

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1.活动的内容和安排；

2.你的感受。

注意：

1.写作词数应为80左右；

2.请按如下格式在答题卡的相应位置作答。

Dear Jim,

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Yours,

Li Hua