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Read the following passage and mark the letter A, B, c, or D on your answer sheet to indicate the correct answer to each of the following questions.

  Scientists have developed a new bionic computer chip that can be mated with human cells to combat disease. The tiny device, smaller and thinner than a strand of hair, combines a healthy human cell with an electronic circuitry chip. Doctors can control the activity of the cell by controlling the chip with a computer.

  It has long been established that cell members become permeable when exposed to electrical impulses. Researchers have conducted genetic research for years with a trial-and-error process of bombarding cells with electricity in an attempt to introduce foreign substances such as new drug treatments or genetic material. They were unable to apply a particular level of voltage for a particular purpose. With the new invention, the computer sends electrical impulses to the chip, which triggers the physicians to open a cell’s pores with control.

          Researchers hope that eventually they will be able to develop more advanced chips whereby they can choose a particular voltage to activate particular tissues, whether they be muscle, bone, brain, or others. They believe that they will be able to implant multiple chips into a person to deal with one problem or more than one problem.

The word they in the first sentences of the third paragraph refers to      _________.

A. chips

B. tissues

C. voltages

D. researchers

Nguyen Hoang Hai
13 tháng 11 2019 lúc 11:40

Đáp án D.

Key word: they, first sentences, third paragraph, refers.

Clue: Researchers hope that eventually they will be able to develop more advanced chips whereby they can choose a particular voltage to activate particular tissues ...”

Vậy ta chọn đáp án D. researchers.


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