You won’t find even a single grain of rice at the home of Aubrey Graf-Daniels. The grain is off limits for dinnertime.

On a recent night, she was busy preparing the dish for her family. “I stopped eating rice about 2 to 3 years ago because I'd heard about the arsenic,” she told CBS News.

In recent years, there's been concern about this contaminant in rice. Arsenic is to cause health problems. The U.S. Food and Drug Administration has been monitoring levels for decades and has said the arsenic levels found in rice products are too low to cause short-term issues.

But research is also finding that arsenic can have a longer-term impact on health, and is linked to certain cancers and heart disease.

“The number of health effects we contribute to arsenic has grown over time,” Dr. Joseph Graziano said. 

Graziano’s lab at Columbia studied arsenic in water and its effects on pregnant women. He found higher levels can be particularly problematic for the newborns. “We’ve learned arsenic can change the DNA,” he said. “It may influence the health outcomes later in life.”

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1.Why did Aubrey Graf-Daniels stop eating rice?

A Because she hate eating rice.

B Because rice is much too experience.

C Because she heard about arsenic in rice.

D Because arsenic could destroy the taste of rice.

解析：选C。C 细节理解题。根据第二段I stopped eating rice about 2 to 3 years ago because I'd heard about the arsenic可知，故选C。

2.According to The U.S. Food and Drug Administration,_____________.

A arsenic can cause short-term issues

B certain cancers may result from arsenic

C heart disease has no link to arsenic

D there is no need to worry about arsenic in rice

解析：选B。B 内容理解题。根据第四段内容…and is linked to certain cancers and heart disease.可知，故选B。

3.Who is the victim of higher levels of arsenic in water?

A Pregnant women.

B Newborn babies.

C Fish in water.

D Anyone who drinks water.

解析：选B。B 内容理解题。根据最后一段第一第二句可知，故选B。

4.Which can well explain “arsenic can have a longer-term impact on health”?

A Higher levels can be particularly problematic for newborns.

B Arsenic is linked to certain cancers.

C Arsenic is linked to heart disease.

D Arsenic may influence the health outcomes later in life.

解析：选D。D 内容理解题。D选项说明了砷可能会影响今后的健康结果正与上文所述的长期影响相对应，故选D。

5.What does the underlined words “the newborns” mean in the last paragraph?

A The children that the pregnant women will give birth to.

B The pregnant women.

C The new DNA.

D The health outcomes.

解析：选A。A 语义理解题。newborn指研究对象怀孕妇女所生下的孩子，故选A。