A pretty city with an interesting flower market ________ in the world．


  1. A.
    is famous
  2. B.
    is famous for
  3. C.
    are famous
  4. D.
    are famous for
A
主語是with之前的a city, be 用單數(shù)．Be famous for“因……而出名”，該題后面沒有具體指明出名的原因，for不需要．
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科目：初中英語 來源：2012-2013學(xué)年北京市延慶縣九年級(jí)上學(xué)期期末考試英語試卷（解析版） 題型：閱讀理解

It is easy for us to tell who our family members are, but do plants recognize(識(shí)別) their own family? Some do, scientists say, according to a report by Science News in early 2010.

Guillermo P. Murphy and Susan Dudley are two plant scientists from McMaster University in Hamilton, Canada. They did a few experiments with Jewelweeds, a kind of flower that grows in wet, shady spots. They found that the flowers seem to know their own flower family. In their experiments, Murphy and Dudley planted jewelweeds in pots with either siblings or strangers.

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When jewelweed seedlings(幼苗)were planted with siblings, they grew a few more branches than they usually would if they were alone – but they did not start growing lots of extra leaves. This behavior suggests the plants are more likely to share resources, rather than compete.

According to the Science News report, Jewelweeds are not the first plants that plant scientists have studied for family recognition. In 2007, Dudley and her team studied the Great Lakes sea rocket, a plant that grows on the beach – where it may be hard to get fresh water. In that experiment, the scientists found that when sea rockets were planted with siblings, they tolerated each other. But when they were planted with strangers, the sea rockets reacted by working extra hard to grow lots of roots.

Dudley says this just because sea rockets, on the beach, get plenty of sun but struggle for water – so when they’re threatened, they compete for water. Jewelweeds have plenty of water but have to compete for sunshine, so they grow more leaves.

1. What does the underlined word siblings mean?

A．Flowers come from foreign countries.

B．Plants growing in different environments.

C．Flowers planted with lots of strangers.

D．Plants that are the same kind.

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C．describe a pretty flower                  D．build a new theory

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B．How Plants Compete with Each Other

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1 

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