71. Why did Michel and Carl decide not to have a baby?

1. Because they might give birth to a blind baby.
2. Because Carl might pass his family's disease to his son.
3. Because the boy might become blind when he grows up.
4. Because they wanted a daughter to balance their family.

72. When Michel gave birth to her first girl, the new sperm-separation technique ____.

1. had already been well-developed
2. had not been declared successful
3. was available to those who wanted it
4. had been widely accepted in the medical world

73. Which of the following is the author's primary concern regarding the application of the new technology?

1. The expansion of the new technology may not bring profits to the companies.
2. Most people who use the technology will not have a baby as they want.
3. The effect of the new technology still needs to be carefully examined
4. Increasing use of the technology may disturb the sex balance in the population.

74. The sperm-separation technique is based on the fact that the chromosomes responsible for babies' gender ____.

1. are of different shapes
2. are of different sizes
3. can be identified
4. can be reproduced

75. We can infer from this passage that the new technology ____.

1. may not guarantee people a daughter or a son as they desire
2. is used by most families for non-medical reasons
3. has brought an isolated ethical dilemma for mankind
4. will lead to a larger proportion of females in the population

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