问题 选择题

下图中的四粒玉米种子的不同部位受到了损伤(阴影部位表示有损伤)。请你判断哪一粒种子肯定不会再萌发?(  )

答案

答案:C

题目分析:由我们所学的知识可以知道:种子是由胚和种皮构成的,其中胚是种子最主要的部分,将来发育成植物的新个体.种子萌发除了满足一定的外界条件外,还需要满足胚是完整的,活的等条件.玉米颜色发黄的部位为胚乳是它贮存营养物质的部位.A中种子只损伤到种皮,但未损伤到胚,所以胚是完整的还有可能萌发;B中种子只损伤到种皮和胚乳的一部分,但未损伤到胚,所以胚是完整的还有可能萌发;D中种子损伤到了种皮,但未损伤到胚,所以胚是完整的还有可能萌发,所以A、B、D为错误项.C中种子损伤到了胚,使胚不完整,所以不可能萌发,为正确项..

点评:这是考试的热点。解答本题关键是要知道种子萌发的自身条件,即:胚是完整的,活的等.

阅读理解

阅读理解。

     September can be a depressing month. The summer holidays are over, it's time to go back to work or

school and Christmas is four months away. However, for some people it's the perfect time to get away.

     These days more and more people are taking their holidays late in the year and for good reasons. 

Holidays in autumn can be cheaper, the resorts are less crowded and the weather isn't as extreme as

it is in the summer. So, where are the best places to go? Here are our top tips.

     Sardinia (in Italy) has an average temperature of 27℃ in September. It also has "Autunno in

Barbagia" (Autumn in Barbagia) a series of festivals that take place in 27 villages in Barbagia, a

mountainous region of inland Sardinia. The festivals continue from September to December, so there's

always something happening. There are street markets, craft workshops and there's lots of eating and

drinking (This is Italy, after all).

     Dubrovnik Croatia has become very popular in summer but it's quieter and more pleasant once the

crowds have left. The weather is still warm but less humid. You can take a ferry to the popular beaches

on the islands of Sunj and enjoy it with locals.

     Dahab Egypt, is extremely hot in the summer with temperatures up to 38℃. However, the autumn is

cooler while the sea is still warm. This makes Dahab the perfect place for snorkeling and windsurfing.

There are also interesting historical sites to visit such as the Coloured Canyon, with its dramatic rock

formations, and St Catherine's Monastery, at the foot of Mount Sinai.

     Kas is a relaxed fishing village on the Lycian coast in southern Turkey. There are plenty of things to

do and the temperature has dropped (so you can actually enjoy doing them!) Kas is a good place to stay

if you want to walk part of the Lycian way: a long-distance footpath that stretches for 500km from

Fethiye to Antalya through the ancient land of Lycia. There are also watersports, of course. The best time

to go diving is supposed to be after the first rains of autumn (usually between late September and early

October) when the fish become most active.

     Marrakech Morocco is another good destination. The city itself is a fascinating place to spend a few

days. When you have had enough of that, go to Tigmi, a beautiful hill town about 20 kilometers away.

There's a hammam (a Turkish bath) and a large heated pool, which makes it the perfect place to relax.

     Wherever you go this autumn - have fun!

1. Here are the good reasons for more and more people to take holidays in autumn except that _____.  

A. Holidays in autumn can be cheaper.

B. The scenery in autumn is more attractive.

C. The resorts in autumn are less crowded.

D. The weather is neither too hot nor too cold.

2. We can infer from Paragraph 3 that _______.

A. Visitors can take part in a series of festivals in October in Barbagia.

B. Barbagia in Sardinia is surrounded by mountains.

C. The festivals continue from September to November.

D. The temperature in Sardinia in September is always below 27℃.

3. The underlined word "ferry" in paragraph 4 refers to a kind of _______.

A. bus      

B. plane      

C. boat      

D. taxi

4. For someone who enjoys walking, __________ is the best choice.

A. Kas        

B. Marrakech      

C. Dahab       

 D. Dubrovnik

5. Which of the following places may not be close to sea?

A. Dubrovnik      

B. Dahab        

C. Kas        

D. Marrakech

单项选择题