问题 填空题 计算题

先天聋哑是常染色体隐性遗传病。有一先天聋哑的女性(其父是色盲)与一正常男性(其母是先天聋哑)婚配(先天聋哑基因为a,色盲基因为b)

这对夫妇的基因型是()、()。

答案

参考答案:aaXBXb;AaXBY

阅读理解

阅读理解。

    In most parts of the world, many students help their school make less pollution. They join in

"environment (环境) clubs". In an environment club, people work together to make our environment clean.

    Here are the things students often do.

    Turn off the water! Do you know that some toilets can waste (浪费) twenty to forty tons of water an

hour?

    In a year, that would fill a small river! In environment clubs, students mend those broken toilets.

    No-car day. On a no-car day, nobody comes to school in a car-not the students and not the teachers!

Cars give pollution to our air, so remember:

    Walk, jump, bike or run.

    Use your legs! It's lots of fun!

    No-garbage (垃圾) lunches. How much do you throw away after lunch? Environment clubs ask students

to bring their lunches in bags that can be used again. Every week they will choose the classes that make the

least garbage and report them to the whole school!

    We love our environment. Let's work together to make it clean!

1. After mending the broken toilets, they save            . [ ]

A. a small river

B. a lot of water

C. a toilet

D. a year

2. On a no-car day,             will take a car to school. [ ]

A. only students

B. only teachers

C. both students and teachers

D. neither students nor teachers

3. Environment clubs ask students            . [ ]

A. to run to school every day

B. to play sports every day

C. not to throw away lunch bags

D. not to forget to take cars

4. From this passage we know the students usually have lunch            . [ ]

A. at school

B. in clubs

C. at home

D. in shops

5. The writer wrote the passage to tell students to            . [ ]

A. join in clubs

B. help teachers

C. make less pollution

D. clean schools

选择题