3.做运动____________ 4.看电视_____________ 查看更多

 

题目列表(包括答案和解析)

炭疽热是由炭疽芽孢杆菌引起的,该细菌可引起动物组织水肿、粘膜出血,幷可造成动物死亡。法国科学家巴斯德在研究牲畜炭疽病时进行了如下实验:给实验绵羊注射毒性已削弱的炭疽芽孢杆菌制剂,这些绵羊感染后没有发病。四天后,给实验绵羊注射毒性极强的炭疽芽孢杆菌制剂,经过一段时间后,实验绵羊全部正常生活。根据以上资料,回答以下问题。
(1)实验绵羊在第二次注射炭疽芽孢杆菌制剂后没有发病,其原理是体内产生____,该物质的化学本质是____,它是由____细胞产生分泌的。与之合成和分泌相关的细胞器有____________,这种免疫属于____免疫。
(2)如果不能确定第二次注射的炭疽芽孢杆菌对实验绵羊的毒性是否极强,需要改进实验设计,请在上述实验的基础上补充相应的实验设计原则、步骤。
①实验设计原则:____________
②操作步骤:____________

查看答案和解析>>

David,an __boy can write in Chinese.

A. 8_years_old   B. 8_years   C. 8_year_old   D. 8_years old

 

查看答案和解析>>

Cinderella has to do all the housework. She makes the beds. She watches the clothes. She cleans the room. She __ the meals. She goes shopping_____the family.

One day, the family goes to a __ at the prince’s palace (皇宫). Cinderella is __. She says, “I want to go and dance, too! ”

Then, a fairy(仙女) comes and says, “I can help you. ” She gives Cinderella a party dress and a pair of glass __. Then she says, “Come home early. You must get home before 12:00___”

Cinderella goes to the party and __ with the prince. She forgets about the__. Then she sees a clock. It is almost midnight. Cinderella __ home and she gets home right at 12:00, ______she loses one of her glass shoes on the way.

1.AeatsBmakes Cbuys Dgives

2.AwithBup Cin Dfor

3.ApartyBmovie Cpicnic Dtrip

4.ArelaxingBbusy Chappy Dboring

5.Ashoes Bhats Cpants Dgloves

6.Ain the moringBin the afternoon Cin the evening Dat night

7.A. sings B. dances C. plays D. talks

8.AclothesBhousework Cmusic Dtime

9.Agoes Bwalks Ctakes Druns

10.Abut Band Cso DBecause

 

查看答案和解析>>

Cinderella has to do all the housework. She makes the beds. She watches the clothes. She cleans the room. She __ the meals. She goes shopping_____the family.
One day, the family goes to a __ at the prince’s palace (皇宫). Cinderella is __. She says, “I want to go and dance, too! ”
Then, a fairy(仙女) comes and says, “I can help you. ” She gives Cinderella a party dress and a pair of glass __. Then she says, “Come home early. You must get home before 12:00___”
Cinderella goes to the party and __ with the prince. She forgets about the__. Then she sees a clock. It is almost midnight. Cinderella __ home and she gets home right at 12:00, ______she loses one of her glass shoes on the way.
小题1:
A.eatsB.makesC.buysD.gives
小题2:
A.withB.upC.inD.for
小题3:
A.partyB.movieC.picnicD.trip
小题4:
A.relaxingB.busyC.happyD.boring
小题5:
A.shoesB.hatsC.pantsD.gloves
小题6:
A.in the moringB.in the afternoon C.in the eveningD.at night
小题7:
A. singsB.dancesC.playsD.talks
小题8:
A.clothesB.houseworkC.music D.time
小题9:
A.goesB.walksC.takes D.runs
小题10:
A.butB.andC.soD.Because

查看答案和解析>>

Sam Kaye is only 12 years old. But he is a famous photographer (摄影师) not only in the UK, but also in_countries. He is even the youngest member of the Royal Photographic Society (RPS,皇家摄影协会) of the UK. It was_in 1853 and it has a long history. It was the_photographic society in the world. About one third of its members are famous photographers all over the world.
Sam Kays started taking photos_the age of six. Last year, the UK schoolboy went on a trip to Africa with his parents. He took lots of photos of African _such as lions, elephants, foxes and birds. He_these photos to the Royal Photographic Society of the UK. People at the RPS were_to see Sam’s photos. They said the photos were so great.
Sam likes photography and his dream is to be a_in the future. Sam’s parents are_of their son. They encourage him to_his dream. They say his dream can come true one day.
小题1:
A.anotherB.the otherC.otherD.others
小题2:
A.picked upB.set upC.put onD.got on
小题3:
A.youngestB.newestC.oldestD.fewest
小题4:
A.forB.inC.onD.at
小题5:
A.plantsB.animalsC.historyD.buildings
小题6:
A.receivedB.gotC.sentD.took
小题7:
A.surprisingB.gladC.boringD.bored
小题8:
A.doctorB.photographerC.teacherD.painter
小题9:
A.sadB.pleasedC.proudD.strict
小题10:
A.keepB.loseC.missD.Choose

查看答案和解析>>


同步练习册答案