________(48)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks.

Mobile phones______ (41) microwave radio emissions. Researchers are questioning whether exposures to these radio waves might _______(42) to brain cancer.

So far, the data are not conclusive. The scientific evidence does not _____(43) us to say with certainty that mobile phones are categorically______ (44) . On the other hand. current research has not yet ______(45) clear adverse effects associated with the prolonged use of mobile phones.

Numerous studies are now going _______(46) in various countries. Some of the results are contradictory but others have shown an association between mobile phone use and cancer. ______(47) , these studies are preliminary and the issue needs further, long-term investigation.

________(48) the scientific data are more definite, it is prudent for people to try not to use mobile phones for long periods oi‘ time. Don’t think that hands-free phones are any safer either. At the moment. research is in fact showing the _______(49) and they may be just as dangerous.

It is also thought that young people________ (50) bodies are still growing may be at particular risk.

Câu 26258: ________(48)

A. When

B. Provide

C. Until

D. As

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Câu hỏi : 26258

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Đáp án : C
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