Which of the following work is included in the RAS project？A．Finding out the most common f

Why do drug companies make no effort on the study of RAS?

A．Because they can"t find how medicine can take effect on RAS.

B．Because RAS is often mutated and changes forms.

C．Because it doesn"t seem to be of vital importance on treating cancers.

D．Because RAS binds firmly with cells and are inseparable.

What makes the RAS project a " megaproject" in Harold Varmus words?

A．Its total expense.

B．Its magnificence.

C．Its number of researchers.

D．Its huge profits.

What does the National Cancer Institute intend to do?

A．To deal with the budget problem of its contract lab.

B．To attract more outside researchers to its research.

C．To find out how to tackle a cancer-related protein.

D．To separate the mutated cells from healthy ones.

Which of the following would be the best title for the passage?

A．SIDS

B．Back to Sleep Reduces Death of SIDS

C．The Use of a Fan Reduces Death of SIDS

D．Ways to Reduce Death of SIDS

The death toll of SIDS in the near future will

A．increase a little.

B．decrease to some extent.

C．remain steady as before.

D．increase a lot.

What does "the two other new studies" in Paragraph 4 aim to survey?

A．The campaign to have babies sleep on their backs has been very successful.

B．The campaign to have babies sleep on their backs isn"t getting to everyone.

C．How baby-carers are implementing existing guidelines for reducing SIDS deaths.

D．How many percent of parents are not following recommendations of back-to-sleep.

The research in Paragraph 3 is mentioned to prove that

A．to use a fan seemed to be effective for infants in high-risk environments.

B．control infants are matched by county, race, ethnicity and age to the first group.

C．fans improve ventilation and decrease the chance of rebreathing exhaled carbon dioxide.

D．using a fan in high-risk environments, infants will no longer die of SIDS.

Which of the following may increase the risk of SIDS, according to Parisis steps?

A．Make babies sleep on the back.

B．Cover babies with more blankets.

C．Keep the air in bedrooms ventilated.

D．Keep the temperature in bedrooms cool.

We can infer from Paragraph 6 that

A．home prices has fallen down 28% compared with what"s in mid-2006.

B．many foreclosed homes have been abandoned by their former owners.

C．home prices might fall down 28% from their peak in mid-2006 in the future.

D．more foreclosed homes have been abandoned because of the falling price.

What can be inferred from Sal Guatieris comments?

A．House sales worsened other sections of the economy.

B．House sales resulted in the worsening credit crunch.

C．The credit crunch worsened the whole economy.

D．Mortgage applications have been falling for 6 years.