its complexity, with humans.

For drug and other lab tests, scientists have to purchase monkeys from all over the world, which is costly and bad for the envir onment, and produces inaccurate results because each monkey might have different genes. By cloning monkey using somatic cells, we can massively cultivate large numbers of genetically identical offspring （后代）in a short amount of time, and we can even change their genes to suit our needs. This can save time, cut down experiment costs, and produce more accurate results, leading to more effective medicine.

Sun Qiang, director of the non-human primate research facility at the institute, said most of the drug trials are currently done on lab mice. However, drugs that work on mice might not work or even have severe side effects on humans because the two species are so different.

“Monkeys and humans are both primates（灵长类）, so they are much closely related and testing on monkeys is supposed to be as effective as testing on humans,” he said. “This is especially useful in testing drugs for neural （神经的）diseases such as Parkinson’s disease, metabolic syndrome （代谢综合症）and immune system diseases, and tumors,” he added.

“This ac hievement will help China lead the world research in the international science projects related to neural mapping of primate brains,” he said. “However, bio-labs in the United States, Japan, and European countries are also very capable, and they will quickly catch up with China after the monkey cloning technology is made public,” Sun added.

“This means we have to innovate continuously and work extremely hard this year to stay ahead.” he said.

32. Which of the following is the most important factor in clonin g macaques named “Zhong Zhong” and “Hua Hua”？

A. Reproductive cells.

B. Genetic makeup.

C. Embryo splitting.

D. Somatic cells.

33. Why is cloning monkeys so difficult？

A. Because it is bad for our environment.

B. Because each monkey might have different genes.