问题 问答题

编一蔷薇科分亚科检索表

答案

参考答案:

蔷薇科含四亚科,各亚科之间的区别主要体现在果实和花的构造上。以下分亚科检索表即据此编制而成。

蔷薇科分亚科检索表

1.心皮离生或仅基部合生

2.心皮常5,花托(花筒)浅杯状,聚合骨突果。无托叶。„„„„„„绣线菊亚科

2.心皮多数,花托凸起或下凹,聚合瘦果或聚合核果。托叶发达。„„„„蔷薇亚科

1.心皮合生或仅具1心皮

2.2—5,子房下位或半下位。梨果„„„„„„„„„„„„„„„„„苹果亚科

3.心皮1,子房上位,核果„„„„„„„„„„„„„„„„„„„„„梅亚科

改错题
阅读理解

Tokyo is one of those places that you can love and hate at the same time. In Tokyo there are always too many people in the places where I want to go. Of course there are too many cars. The Japanese drive very fast, but in Tokyo they often spend a long time in traffic jams. Tokyo is not different from London, Paris and New York in that, it is different when one wants to walk.

At certain times of the day there are a lot of people on foot in London's Oxford Street. But the streets near the Ginze in Tokyo always have a lot of people on foot, and sometimes it is really difficult to walk. People are very polite; there are just too many of them.

The worst time to be in the street is at 11:30 at night. That is when the night-clubs are closing and every-body wants to go home. There are 35,000 night-clubs in Tokyo, and you do not often see one that is empty(空的).

During the day, most people travel to and from work by train. Tokyo people buy six million train tickets every day. At most stations, trains arrive every two or three minutes, but at certain hours there do not seem to be enough trains. Although they are usually crowded, Japanese trains are very good.  They always leave and arrive on time.

In Tokyo, I stood outside the station for five minutes. Three fire-engines raced past on the way to one of the many fires that Tokyo has every day. Tokyo has so many surprises that none of them can really surprise me now.

小题1: Tokyo is different from London in that ______________.

A.it has a larger population

B.there are more traffic jams

C.night clubs are sometimes empty

D.it is more difficult to go somewhere on foot小题2:Fires break out___________ in Tokyo according to the writer.

A.not very often

B.only several times a day

C.quite often

D.very seldom小题3:Which of the following is NOT true about Tokyo?

A.The streets become more crowded at 11:30 at night.

B.There are more trains than cars.

C.Fire-engines are very busy in the city.

D.Tokyo people are friendly.