单项选择题

Why does the author mention genetic engineering and computer science

A．To compare them with the new materials.
B．To show the significance of the new materials on the future world.
C．To compare the new materials to them.
D．To explain his viewpoint.
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单项选择题
Why is transition so difficult
A．Because transition requires money and time.
B．Because many manufacturers are unwilling to change their equipment.
C．Because research on new materials is very difficult.
D．Because it takes 10 years.
单项选择题
According to the passage, the author implies that________.
A．participation in interesting activities relating to a school subject improves one' s achievement in that area
B．teachers should occasionally make home visits to parents
C．too many children are lazy and have poor work habits
D．only a small part of the school day should be set apart for drilling arithmetic
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