Many people do not think of trees as a crop．But Christmas trees are a crop just like any other．In the United States alone，people last year bought more than one-thousand-million dollars worth of Christmas trees．
The traditional tree for the holiday is a fir，spruce or pine．These stay green all year．Evergreens have thin needles instead of leaves．This prevents the loss of water during dry or cold period．This quality makes evergreens the perfect choice for use．They can stay green for many weeks，even after being cut．
Oregon，in the Pacific Northwest，is the biggest grower of Christmas trees in the United States，Michigan，North Carolina，Wisconsin and Pennsylvania are also major growers．There are more than fifteen-thousand tree farms in the United States and Canada．More than four-hundred-thousand hectares of Christmas trees are planted．
The trees take an average of seven years until they are ready for harvest．Up to five thousand trees can be grown on a single hectare．Every year，more than seventy-million Christmas trees are planted．Growers plant at least two new trees for every one they harvest．
The Agriculture Department says eighty percent of homes in the United States have some kind of Christmas tree．Unlike other crops，Christmas trees have a competitor made of plastic．They never turn brown，and can be used from year to year．In 1989，sales of natural trees and artificial trees were equal．By 2000，however，sixty-one percent of the trees sold were plastic．
The number of real Christmas trees sold has decreased in recent years．Fewer hectares are being planted in Canada．But the price of Christmas trees has continued to increase．The average tree costs about thirty-six dollars．
Poinsettia plants are increasingly popular at Christmas．But sales are small compared to trees．The tradition of the Christmas tree is said to have begun in Germany hundreds of years ago．People put fruits and nuts，paper flowers and other objects on the tree to make it more beautiful．German settlers brought the tradition to America in the middle of the 1800s．At the time，people cut trees from forests．Over time，Christmas tree farming developed and grew into an industry．
（1）What's the similarity between Christmas trees and crops？DD
A．They are both planted by human．
B．They are both valuable．
C．They can both bring money to people．
D．They are both crops．
（2）Why are evergreens the choice for Christmas trees？AA
A．Because they can stay green for many weeks，even after being cut．
B．Because they are easy to get．
C．Because they are a crop．
D．Because they are cheep．
（3）The passage infers thatDD．
A．Oregon is the biggest grower of Christmas trees in the world
B．Canada grows more Christmas trees than the US
C．there are more Christmas tree farms in the US than in Canada
D．the number of trees planted each year is bigger than that cut
（4）Why are less real Christmas trees sold in recent years？DD
A．Because fewer hectares of Christmas trees are being planted in Canada．
B．Because the price of Christmas trees has continued to increase．
C．Because Christmas trees are no longer popular．
D．Both A and B．
【考點】日常生活．
【答案】D；A；D；D
【解答】
【點評】
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發(fā)布：2024/4/20 14:35:0組卷：1引用：1難度：0.5
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Math departments alone are unlikely to solve this dilemma.Several of the promising calculus reforms were spearheaded by professors outside of math departments.STEM faculty are prioritizing cooperation across disciplines to transform math classes to cultivate a diverse generation of STEM researchers and professionals.
This is not uncharted territory.In 2013，life sciences faculty at the University of California，Los Angeles，developed a two-course sequence that covers classic calculus topics，but also emphasizes their application in a biological context.Creating this course，Mathematics for Life Scientists，wasn't easy.The life sciences faculty involved，none of whom had a joint appointment with the math department，said they turned to designing the course themselves after math faculty rejected their request for cooperation.
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（1）What problem is mentioned in paragraph 1？
A．Increasing STEM dropout rate.
B．The reform of calculus courses.
C．Shrinking admission to STEM majors.
D．The shaken belief in the role of calculus.
（2）What does "spearheaded" in paragraph 2 probably mean？
A．challenged
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（3）What do we know about the calculus course reform according to the text？
A．STEM departments made calculus content easier to improve students' grades.
B．Math departments sought cooperation with STEM counterparts to urge reforms.
C．Placing calculus learning in specific STEM contexts is a workable approach.
D．Removing calculus is the key to increasing graduation rate of STEM students.
（4）What does "the opposite" in the last paragraph refer to？
A．The STEM fields may be the foundation of other science subjects.
B．The STEM fields may be central to making math learning effective.
C．Math learning may set barrier for science study in the STEM fields.
D．Math learning may make way for science study in the STEM fields.發(fā)布：2025/1/1 17:30:2組卷：24引用：3難度：0.5 -
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（1）Why did the author want to have a good appearance when she was young？
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C．Because she wanted to get higher scores in the job interviews.
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（2）Why did the writer refer to her friend's story？
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（4）Which of the following covers the passage best？
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D．Those who have good appearances should also develop the beauty in their hearts.發(fā)布：2025/1/1 18:0:1組卷：12引用：2難度：0.6 -
3．You run into the grocery store to quickly pick up your item.You grab what you need and head to the front of the store.After quickly sizing up the check-out lines，you choose the one that looks fastest.You chose wrong.People getting in other lines long after you have already checked out and headed to the parking lot.Why does this seem to always happen to you？
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（1）What phenomenon is described in the first paragraph？
A．Queuing in a line.
B．A shopping experience.
C．A rush in the morning.
D．Cutting in a line.
（2）According to the article，what may cause delays in checking out？
A．The lack of employees in the grocery store.
B．Some unexpected delays of certain customers.
C．The increasing items bought by customers.
D．A worsening shopping system of the store.
（3）What is the solution given by mathematicians？
A．Employing more workers for checking out.
B．Limiting the number of queuing people.
C．Making only one line available.
D．Always standing in the same line.
（4）What's the principle behind the queuing theory？
A．To pursue the maximum benefit.
B．To leave success or failure to luck.
C．To avoid the minimum loss.
D．To spread the risk equally among everyone.發(fā)布：2025/1/1 17:30:2組卷：2引用：2難度：0.5
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