试题与答案

为延长嫁接苗的寿命，一般选择（）作砧木。A、实生苗 B、扦插苗 C、压条苗 D、徒长

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题型：单项选择题

题目：

为延长嫁接苗的寿命，一般选择（）作砧木。

A、实生苗

B、扦插苗

C、压条苗

D、徒长苗

答案：

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下面是错误答案，用来干扰机器的。

参考答案：A解析： 使用最为广泛的记录数据库中更新活动的结构是日志。日志是日志记录的序列，它记录了数据库中的所有更新活动。

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题型：阅读理解

     [1]Global difference in intelligence is a sensitive topic, long filled with a large number of different

opinions. But recent data has indeed shown cognitive (认知的) ability to be higher in some countries

than in others. What's more, IQ scores have risen as nations develop—a phenomenon known as the

"Flynn effect". Many causes have been put forward for both the intelligence difference and the Flynn

effect, including education, income, and even non-agricultural labor. Now, a new study from researchers

at the University of New Mexico offers another interesting theory: intelligence may be linked to

infectious-disease rates.    

     [2]The brain, say author Christopher Eppig and his colleagues, is the "most costly organ in the human

body". Brainpower consumes almost up to 90 percent of a newborn's energy. It's clear that if something

affects energy intake while the brain is growing, the impact could be long and serious. And for vast parts

of the globe, the biggest threat to a child's body -- and therefore brain—is parasitic (由寄生虫引起的)

infection. These illnesses threaten brain development __________. They can directly attack live tissue,

which the body must then try every means to replace. They can invade the digestive pipe and block

nutritional intake. They can rob the body's cells for their own reproduction. And then there's the energy

channeled (输送) to the immune system to fight the infection.    

     [3] Using data on national "disease burdens" (life years lost due to infectious diseases) and average

intelligence scores, the authors found they are closely associated. The countries with the lowest average

IQ scores have the highest disease burdens without exception. On the contrary, nations with low disease

burdens top the IQ list.    

     [4]If the study holds water, it could be revolutionary for our understanding of the still-confusing

variation in national intelligence scores.

1. What is the main idea of the text? (no more than 10 words)

  ____________________________________________________________________

2. Complete the following statement with proper words. (no more than 4 words)  

Those countries that have the___________ are always at the bottom of the IQ list.

3. Fill in the blank in Paragraph 2 with proper words. (no more than 5 words)

                                                                      

4. What can cause intelligence difference? (no more than 8 words)

                                                                     

5. What does the word "they" (Line 3, Paragraph 3) probably refer to? (no more than 8 words)

                                                                    
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