3. The sentence “The genetic genie is out of the bottle.” in Para. 2 probably means _______ .
A. the genetic genie, the key technology in producing genetically modified foods, is out in the market
B. the genetic technology has come out of laboratories into markets
C. genetically modified foods are available everywhere
D. technology with which to produce genetically modified foods may have powers unpredictable or uncontrollable by man
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4. According to the passage, biotech can help solve the problem by _______ .
A. producing foods that contain more nutrients needed by human beings
B. creating more varieties of foods
C. producing beta-carotene and vitamin A more efficiently
D. producing anti-virus crops
2. According to the passage, genetically modified foods ______ .
A. are superior to naturally grown foods
B. might prove to be risky to human health
C. are going to replace naturally grown foods
D. can solve the food problems in developing countries
5. The author's attitude toward genetically modified foods is ________ .
A. enthusiastic
B. cautious
C. disapproving
D. optimistic
（Unit2 TextA-1）Please select the Verb of the Main sentence (主句）.The data show that as students have increasingly shouldered the ever-rising cost of tuition, they have defected from the study of the humanities and toward applied science and "hard" skills that they bet will lead to employment.
A. show
B. have defected
C. bet
D. will lead to
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