题目内容

Resistance against insects is achieved by incorporating into the food plant the gene for toxin production from the bacterium Bacillus thuringiensis (Bt). This toxin is currently used as a conventional _____________ in agriculture and is safe for human consumption.

A. drug
B. antibiotics
C. insecticide
D. antkiller

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Herbicide ____________ is achieved through the introduction of a gene from a bacterium conveying resistance to some herbicides. In situations where weed pressure is high, the use of such crops has resulted in a reduction in the quantity of the herbicides used.

A. sensitivity
B. tolerance
C. reactivity
D. hypersensitivity

Monsanto developed Roundup, a glyphosate-based ___________ in the 1970s, and became a major producer of genetically engineered crops.

A. drug
B. herbicide
C. insecticide
D. antikiller

In 2017, global area of biotech crops was ________ million hectares.

A. 185.8
B. 189.8
C. 191.8
D. 195.8

In2017, the areaofbiotechcrops in the US was________millionhectares.

A. 50.2
B. 60.2
C. 65.2
D. 70.0

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