单项选择题

According to the passage, biotech can help _________.

A．produce anti-virus crops
B．create more varieties of foods
C．produce beta carotene and Vitamin-A more efficiently
D．produce foods that contain more nutrients needed by human beings
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单项选择题
In the author's opinion, a teacher must constantly evaluate her own attitudes in that _________.
A．her personal attitudes may affect her students if she is prejudiced
B．she need to improve herself too
C．she is also often influenced by her students
D．she may not have a constant attitude towards some controversial issues
单项选择题
The author uses the phrase the burnt child fears the fire in order to _________.
A．stress the importance of keeping child from the fire
B．express the opinion that attitudes come from experience
C．illustrate the role of attitudes play in the early childhood
D．demonstrate that process affects the behavior of child
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