问题 选择题

深海没有植物生存主要受哪种因素的影响?(  )

A.阳光

B.温度

C.气体

D.盐度

答案

光在海水中的穿透性有浅到深越来越弱,最浅处光最强,有红光也有蓝紫光,有利于绿藻利用,所以是绿藻;往下一些红光穿透性不强被海水吸收,能利用起来用作光合作用的只剩蓝紫光,褐藻有利于吸收蓝紫光,是褐藻;再往下,蓝紫光也被吸收一部分,是红藻;最深处没有光,因此没有植物生存,只有一些硫化菌,因此阳光影响海水中植物的分布.

故选:A.

阅读理解

阅读理解。

     Are you looking for some new and exciting places to take your kids (孩子) to? Try some of these

places

     Visit art museums. They offer a variety of activities to excite your kids' interest. Many offer workshops

for making land-made pieces, traveling exhibits, book signings by children's favorite writer, and even

musical performances and other arts.

     ·Head to a natural history museum. This is where kids can discover the past from dinosaur(恐龙)

models to rock collections and pictures of stars in the sky. Also, ask what kind of workshops and

educational programs are prepared for kids and any special events that are coming up.

      ·Go to a Youtheater. Look for one in your area offering plays for child and family visitors. Pre-show

play shops are conducted by area artists and educators where kids can discover the secret about

performing arts. Puppet (木偶) making and stage make-up are just a couple of the special offerings you

might find.

     ·Try hands-on science. Visit one of the many hands-on science museums around the country. These

science play-lands are great fun for kids and grown-ups alike. They'll keep your child mentally and

physically active the whole day through while pushing buttons, experimenting, and building. When

everyone is tired, enjoy a fun family science show, commonly found in these museums.

1. If a child is interested in the universe, he probably will visit        

A. a Youtheater

B. an art museum

C. a natural history museum

D. a hands-on science museum

2. What can kids do at a Youtheater? 

A. Look at rock collections.

B. See dinosaur models.

C. Watch puppet making.

D. Give performances.

3. What does "hands-on science" mean in the last paragraph?

A. Science games designed by kids.

B. Learning science by doing things.

C. A show of kids' science work.

D. Reading science books.

4. Where does this text probably come from?

A. A science textbook.

B. A tourist map.

C. A museum guide.

D. A news report.

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