问题 选择题

小麦、玉米、大豆等种子内的有机物主要来源于(  )

A.植物的呼吸作用

B.植物的光合作用

C.茎的输导作用

D.根吸收作用

答案

A、植物的呼吸作用 细胞利用氧,将有机物分解成二氧化碳和水,并将储存在有机物中的能量释放出来,供给生命活动的需要,这个过程叫做呼吸作用. 不符合题意.

B、植物的光合作用  光合作用实质上是绿色植物通过叶绿体,利用光能,把二氧化碳和水转化成储存能量的有机物,并且释放出氧气的过程.光合作用的原料:二氧化碳和水; 条件:光能; 场所:叶绿体产物:有机物(淀粉)和氧气.小麦、玉米、大豆种子中的有机物主要来源于其植株的光合作用制造.符合题意.

C、茎的输导作用  导管:向上输送水分和无机盐,位于木质部内.筛管:向下输送叶片光合作用产生的有机物,位于韧皮部.不符合题意.

D、根吸收作用 根吸水、无机盐的部位主要是根尖的成熟区.成熟区生有大量的根毛. 土壤里的水分被根毛吸收后,并不停留在根毛和表皮里,而是经过表皮以内的层层细胞,逐步向里面渗入,最后进入导管,再由导管输送到植物的其他器官.不符合题意.

故选:B

阅读理解

The national schools’ first aid competition is an interesting way for young people to practice their first aid skills in a safe environment.

A school may have three teams. The deadline for this competition has now been continued to April 21, 2012. All teams will compete at an elimination (淘汰) round, with the winners going forward to the National Final for the chance to become the winner.

A team has three formal members, and a reserve is also needed. All team members, together with the reserve, will take part. There are two age sections:

Junior: 7 to11

Senior: 12 to 16

This competition is based on the Young First Aid Course from St. John Ambulance Training Officer. Support will be given to make sure everyone has equal chances to win.

The winners of this competition will be invited to take part in the Young Grand Prior Competition. This competition improves the practical first aid skills of young people and tests their knowledge and skills with a series of realistic accidents and injuries. Youth teams are aged between 12 and 16 years old and should have three members. Young adults are aged between 17 and 21 and should have two members. All teams may bring a reserve. The Young Grand Prior Competition will be held at the Spa Complex, Scarborough, on November 28, 2012.

Those who want to take part in the national schools’ first aid competition will have to complete our application form.

小题1: If you are fifteen and want to take part in the competition, you will _________.

A.belong to the junior sections of the first aid competition

B.complete our application form by the end of April, 2012

C.study the course of St. John Ambulance Training Officer

D.teach yourself a lot of knowledge and skills of first aid小题2: How many students will stand for a school?

A.Sixteen

B.Twelve

C.Four

D.Three小题3:Form the passage we can learn that the Young Grand Prior Competition will __________.

A.have a test with realistic accidents and injuries

B.not allow the adult competitors to take part in

C.be the highest level competition in the country

D.be held on April 21, 2012小题4:The passage is written mainly for __________.  

A.those who want to practice their first aid skills

B.the young school students in the country

C.the middle school teachers in the country

D.the young people throughout the country

单项选择题