如图是同一温度下,绿色植物光照强度和二氧化碳吸收量的关系曲线,下列相关叙述正确的是( )
A. AD段植物的光合作用逐渐加强,呼吸作用逐渐减弱
B. 该曲线表明,随着光照强度的增强光合作用不断加强
C. DE段表示植物体内有机物的合成与分解量相等
D. AB段(不含A、B点)绿色植物呼吸作用强于光合作用
九年级生物单选题简单题查看答案及解析
假如你叫李华,今年由于新冠肺炎爆发,学校延迟开学,学生居家抗击疫情。你的国外笔友Bob发来email,想知道你在居家隔离期间做了些什么(关注疫情、线上学习、积极锻炼、帮做家务、博览群书)。请回信告知并谈谈自己的感受。
参考词汇:新冠肺炎爆发the outbreak of COVID-19 疫情epidemic
注意: 1.回信须包含提及的所有要点;
2.文中不能出现真实学校和姓名;
3.词数: 100左右。
Dear Bob,
How's it going?
______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Yours,
Li Hua
九年级英语书信作文中等难度题查看答案及解析
Which animals are smart? Your answer may be dogs, monkeys or elephants. Now we can put one more animal into the list: sheep.
Scientists from Cambridge University said that they can teach sheep to tell familiar (熟悉的)human faces from other unfamiliar ones.
Before testing, scientists let the sheep take a look at pictures of four famous people, such as Barack Obama and British actress Emma Watson. Then the sheep went into a room with two computer screens. Each screen showed a human face. One screen showed a famous person and the other screen showed a common person。The sheep would always walk to the screen with the face of famous persons.
Then, the scientists wanted to know the sheep's ability to recognize(认出) them from a photo. They put their own photos on screens along with some pictures of unfamiliar(不熟悉的) faces. Not surprisingly, the sheep could tell the scientists from others.
After noticing the animals' ability to recognize people, scientists gave them a new job. They wanted to see the farm animals' ability to recognize the same person if the picture only showed half of the person's face or just one side of a person. The animals were still able to recognize them, though they were a little slower to recognize the pictures than before.
The results show that the animals' face-recognition( 面部识别) abilities are similar to those of monkeys and humans. Face recognition is a difficult job. But sheep have big brains(大脑). When they see other sheep, they can also recognize one another.
The scientists said it might be interesting in the future 10 find out whether sheep can recognize different human facial expressions(表情)
Unusual smart animal-the sheep | |
Scientific 1. | ★Sheep's face-recognition abilities were similar to those of monkeys and humans. |
★Sheep's big brain2.in the face recognition job. | |
A set of tests that 3.got harder | ★To tell famous persons from common persons The sheep were asked to choose between photos of famous and common persons. And they always walked to the photos of famous persons. |
★To recognize the persons around them Scientists put their own pictures into the tests. And the sheep could tell them from others as 4. | |
★To recognize the same person from different sides The sheep were shown only half or one side of a person's face. And they spent a 5.to finish the job successfully. | |
★To recognize human facial expressions The interesting test would be done in the future. |
九年级英语信息归纳困难题查看答案及解析
“Feel bored staying at home? So does the virus.1. "This is how Zhang Wenhong advised people to stay indoors during the outbreak of COVID-19(新冠肺炎),As the head of the Shanghai expert team, Zhang has become an internet celebrity (名人) due to his funny and straightforward way of talking.
He first caught people's attention in late January, when he asked the members of the Communist Party (共产党员) in his department to go to the frontline hospitals. “When becoming Party members, we vowed(发誓) that we would always put people's interests first,” Zhang said. “This is the moment we live up to the vow.2.No bargaining(讨价还价).” His determination and the way of speaking quickly won praise across the country.3.“I do it in person because I need to encourage other coworkers,” he told the media.
Zhang believes in the traditional Chinese idea that “the best doctors prevent the disease” .That's why he spares no efforts in spreading scientific knowledge on how to prevent the epidemic(流行病)4.He and his team also update their WeChat account every day with timely analyses(分析) of the epidemic. One of his articles got more than 10 million hits. But Zhang might not care about his sudden fame. When asked about his feelings after becoming famous, Zhang told the media, “5.Pay attention to Wuhan. I'm not a celebrity. I'm a doctor.”
A.Don't pay attention to me.
B.Fighting the virus with humor.
C.All Party members must rush to the frontlines.
D.If you stay longer, the virus will be bored to death.
E.His sense of humor has made it easier for the knowledge to reach the public.
F.Meanwhile, as a Party member himself, Zhang set an example by checking on patients every day.
九年级英语补全短文6选5中等难度题查看答案及解析
Have you ever r__________talking back to your parents in a rude way?
九年级英语根据首字母填空中等难度题查看答案及解析
We can't a__________to upset such an important customer.
九年级英语根据首字母填空中等难度题查看答案及解析
Amy is an i__________to all who knows her. She built herself a house out of rubbish.
九年级英语根据首字母填空中等难度题查看答案及解析
It has not been rainy for long. We can see the b__________of the river now.
九年级英语根据首字母填空中等难度题查看答案及解析
The match is full of the u__________. We really don't know which team will win.
九年级英语根据首字母填空困难题查看答案及解析
Calvin waited outside Trudy's bedroom. Then it happened a scream, a very loud scream. Calvin ran to his room and threw himself into bed.
He heard Mama coming down the hall.
“Did you do this?” his mother asked. Calvin looked out from under the covers. His mother stood over him, holding a rubber spider.
“Do what?” he asked.
“You put that thing in my bed,” Trudy told him, stepping out from behind Mama.
“Don't think that just because it's your birthday you can get away with something like this,” Mama scolded (责骂).
“You do want your present, don't you?” That swept the smile off Calvin's face.
“Course I do,” he said.
“Then you apologize(道歉)”
Calvin dropped his head. “Sorry Trudy,” he muttered (嘟囔)
“Here,” Mama said. “Happy birthday.” At the breakfast table she handed Calvin an envelope. Inside were tickets to the show of Lomax the Magnificent, the world. famous magician. “You've got two tickets there,” Mama said, “and I know someone who'd rally love to go along.”She smiled at Trudy,
“You don't mean here, do you?” Calvin asked, eyeing his little sister.
“Well, that would be really nice. But those tickets are yours. If you want to ask somebody.” Calvin didn't wait for his mother to finish. He rushed out of the house to call Rodney, his pal next door, that the two of them were going to see Lomax the Magnicent.
1.Who screamed at the beginning?
A.Calvin. B.Calvin's sister. C.Calvin's friend.
2.Calvin apologized to Trudy__________.
A.unwillingly B.truly C.happily
3.Calvin received his present__________.
A.in the dining room B.in his bed C.inside the theatre
4.Calvin's mother wanted Calvin to__________.
A.ask his friend to the show
B.find out what his friend thought
C.do what she thought was right
5.What is the best title for this passage?
A.Trudy's Spider B.Mother's Tickets C.Calvin's Birthday
九年级英语阅读单选中等难度题查看答案及解析