All of the following are mentioned as factors that encourage fossilization except the

• A、speed of burying
  
  

• B、conditions of the water
  
  

• C、rate at which soft tissues decay
  
  

• D、cause of death of the animal
  
  

Why does the author mention the specimen preserved in the birth canal?

• A、To illustrate that the embryo fossils are quite advanced in their development.
  
  

• B、To explain why the fossils are well preserved
  
  

• C、To explain why the fossils are well preserved
  
  

• D、To prove that ichthyosaurs are marine animals
  
  

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Immigration and Problems

Hundreds of thousands of people supporting immigration rights in the US filled streets all over America in early 2006.Many held signs and American flags and asked to be ___31___as citizens rather than criminals. Senator John McCain held the opinion that the country should open a ___32___ to citizenship to immigrants  (移民)  who were already in the country illegally, while other politicians ___33___for stricter measures—including rounding up undocumented immigrants and sending them back to their home countries.

Canadian officials say that immigration applications continue to rise.Some want to keep the doors ___34___ . They need the labor. About 400.000 immigrants were allowed into the country in 2005, according to the Canadian Government statistics. ___35___ .all this growth means that cities need to adapt. New comers don't always make a smooth transition into jobs for which they are skilled.So industries are using mentoring  (辅导) programs to help new ___36___ find proper jobs.

With the large numbers of undocumented African immigrants arriving in the Canary Islands, the Spanish Government has decided to get ___37___ . There will be no more mass amnesties (特赦)  for the illegal immigrants, and anyone coming to Spain without___38___will be sent back.

France's new immigration and integration law gives the government new powers to encourage high-skilled migration. It takes ___39___ in 2007.The new law authorizes the government to help these identified employers find immigrant workers with needed skills or qualifications. The selected foreign employees will be granted“skills and talents”visas (签证) .But some people show the concern that it'll cause brain drain in ___40___countries.

A.immigrants	B.However	C.developing
D. path	E.open	F.tough
G.effect	H.Therefore	I.developed
J. permission	K.treated	L.called