问题 单项选择题

甜豌豆的紫花对白花是一对相对性状,由非同源染色体上的两对基因共同控制,只有同时存在两个性基因(A和B)时,花中的紫色素才能合成,下列说法中正确的是______。

A.白花甜豌豆杂交,后代不可能出现紫花甜豌豆
B.AaBb测交结果紫花与白花的比例为1:1
C.AaBb的紫花甜豌豆自交,后代中紫花和白花甜豌豆之比例为9:7
D.若杂交后代性状分离比为3:5,则亲本基因型只能是AaBb和aaBb

答案

参考答案:C

解析: 由题意可知,基因型为A_bb和aaB_的两种白花甜豌豆杂交,后代就可能出现AaBb的紫花甜豌豆,A项错误;AaBb测交,子代紫花和白花的比例为1:3,B项错误;AaBb自交,产生A_B_基因型的比例为9/16,C项正确;杂交后代性状分离比为3:5,亲本基因型还可能是AaBb和Aabb,D项错误。

阅读理解

D

The Focal Point of the “ Chinese Liquor Golden Triangle”

In China, there is a saying: a good spirit(wine) is in Sichuan, but the great one is in Yibin.

Yibin, the birthplace of Wuliangye, has a centuries-old tradition of producing great spirits. At the confluence of Jinsha and Min rivers, Yibin is praised as the first city on the source of the Yangtze River. Here, the water is clean, the soil is rich, and the climate is very favorable for brewing good liquor. The blessings of nature and centuries-old liquor brewing traditions gave rise to “ The Ten-Mile Liquor City ”, the main production facility of domestic liquor giant Wuliangye Group Co. Ltd.

Extending across 10 kilometers and dotted with gardens and sculptures, the city attracts domestic and foreign visitors with its famed liquor brewing and related culture. Another attraction is its legendary Ming Dynasty (1368-1644AD) liquor cellars (酒窖,地下储藏室).

The city has 30,000 large modern brewing tanks that provide an enormous capacity to store liquor.

The high quality of Wuliangye also owes much to its unique brewing techniques and materials. These traditional techniques are included on the list of national intangible(非物质的) cultural heritage.

Wuliangye’s sales revenues(销售额)and pre-tax profits accounted for nearly half of the respective (分别的) 59 billion yuan and 12.5 billion yuan generated by Sichuan’s provincial liquor industry in 2008. Liquor production by large enterprises in the province was about 1.1 million kiloliters, accounting for 19.6% of the production in the country.

Wuliangye is now investing 300 million yuan in a state-of-the-art quality assurance center (质保中心)that has higher standards than national requirements, which will boost the existing quality-control system when it is put into service next year.

With a goal of production value of 100 billion yuan for the year of 2020, Wuliangye is playing a leading role in the development of the liquor industry in the region. A lot of related industries are now building up in the region to create a Chinese Liquor Golden Triangle —the Chinese equivalent (相当于)of the French Bordeaux region---that continues to appear on the upper reaches of the Yangtze River.

67. To be exact, the domestic liquor giant Wuliangye Group Co. Ltd. Lies _________.

A. on the Jinsha River              B. in the city of Yibin

C. to the west of Sichuan            D. on the middle reaches of the Youngtze River

68. Which of the following is the most favorable for brewing the good wine?

A. The water       B. The soil         C. The climate          D. The facility     

69. Which of the following is NOT true according to the passage above ?

A. Compared with the western countries, Chinese wines have a long way to go.

B. The Golden Triangle is known for its wines and related industries.

C. Wuliangye’s pre-tax profit accounted for nearly 6.25 billion in 2008.

D. The liquor production of our country in 2008 is about 5,6 million kiloliters.

70. Domestic and foreign visitors go to the city for its _______.

A. famous wine brewing and related culture

B. beautiful geographical landscape

C. historic relics of different Chinese dynasties

D. the source of the Yangtze River

填空题