The college entrance examination is just around the corner. Homework and tests will keep many of you up late at night, and you may plan to make up for your lost sleep during the weekends. {#blank#}1{#/blank#} is it useful? A study published in the journal Current Biology completely has changed {#blank#}2{#/blank#} people used to think. It shows that the habit of sleeping in on weekends doesn't fix the damage done by a lack of sleep during the week. Even {#blank#}3{#/blank#} (bad), it may damage your health.

Eric was a nine-year-old boy who lived with his single mother, Stacey and sister, Lily. They lived a hard life. Eric felt bad for their situation but worse for himself, especially in school.

Eric's leather boots were worn out. They didn't protect his feet from the rain, and his socks became totally wet as water went through the holes in his shoes. Stacey attempted to fix the holes but it was no use. Eric still walked to school with that pair of broken shoes. How much he wished he could also have new comfortable and expensive shoes his classmates wore!

One day, Eric returned from school and complained to Stacey, "It was raining today. Water has leaked into my shoes again. I hate my boots! Why can't you get me new ones?" Stacey was sad and helpless. "I spent our last savings on your sister's medicine. She's sick. Eric you know that. You need to act like a responsible big brother!" she answered. Tears welled up in Eric's eyes. "I hate you!" he shouted. "You only care about Lily! You don't love me!" Then he cried and ran to his room.

After preparing dinner, Stacey went to his room with his dinner plate. "I'm sorry, Eric," she whispered to comfort him. "We're going through a very tough journey recently. But I'll get you new shoes in the future." However, Eric refused to listen to her.

The next day, when Eric went to class, he took his seat quietly and hid his feet under his chair, as usual. He was embarrassed to show his boots. As the math teacher Mrs Fletcher entered the class, all the students greeted her. "Today, we have a very special friend with us," she smiled. "Everyone, please welcome Ben, your new classmate." Soon after, a boy with a pair of crutches(拐杖)entered. The new boy only had one leg. Eric was shocked. He and all his classmates thought how unlucky Ben was and that he must be very shy and sad.

注意：1.续写词数应为150左右;2.请按如下格式在答题卡的相应位置作答。

Paragraph 1: At that moment, Mrs Fletcher asked Ben to introduce himself. 

Paragraph 2: Inspired by Ben, Eric realized he should appreciate what he had. 

D

With the completion of the Human Genome（基因组）Project more than 20 years ago, and the discovery of the double helix structure of DNA enjoying its 70th birthday last year, you might assume that we know how life works. Think again!

Evolution has a 4bn-year head start on us. However, several aspects of the standard picture of how life works-the idea of the genome as a blueprint, of genes as instructions for building an organism, of proteins as precisely tailored molecular（分子）machines and more-have wildly reduced the complexity of life. 

In the excellent book How Life Works, Philip Ball explorers the new biology, revealing life to be a far richer, more delicate affair than we have understood. Ball explains that life is a system of many levels-genes, proteins, cells, tissues, and body modules-each with its own rules and principles, so there is no unique place to look for an answer to it. 

Also, How Life Works is a much more appealing title than the overused question of "What is life?". We should be less concerned with what a thing is, and rather more focused on what a thing does. Defining a living thing implies an unchangeable ideal type, but this will run counter to the Darwinian principle that living things are four-dimensional, ever changing in time as well as space.

But it's an idea that is deeply rooted within our culture. Ball points out that we rely on metaphors（比喻）to explain and explore the complexities of life, but none suffice. We are taught that cells are machines, though no machine we have invented behaves like the simplest cell; that DNA is a code or a blueprint, though it is neither; that the brain is a computer, though no computer behaves like a brain at all.

Ball is a terrific writer, pumping out books on incredibly diverse subjects. There's a wealth of well-researched information in here, and some details that are a bit chewy for the lay reader. But the book serves as an essential introduction on our never-ending quest to understand life.