赞题库-背景图

单项选择题

What is the main topic of this passage

A．Bacteria bioengineering.
B．Genetic engineering.
C．Agricultural technology.
D．Virus biotechnology.

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单项选择题What will be one effect of the new biotechnology on plants

A．They will grow anywhere in the world.
B．Some will be able to grow in salty soils.
C．They will become poisonous to pests.
D．Using nitrogen from the air they will be able to cross-fertilize.

单项选择题Which statement of the following is correct according to this passage

A．The boiling point of a liquid is the original temperature.
B．The higher the pressure on the surface of the liquid, the quicker the boiling point will be reached.
C．The boiling point of a liquid is 100 Celsius.
D．Both Ｂ and Ｃ.