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【判断题】
天然培养基中的激素有胰岛素,生长素和多种生长因子。A.
正确
B.
错误
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举一反三
【单选题】Some boys took chemicals like soda and iodoform. powder because ______.
A.
they liked to set up stalls in the market and sell things, like traders
B.
they were too poor to buy things like soap and medicine
C.
they wanted money and could sell such things quickly
D.
they needed things like soap and medicine for sores
【简答题】Trees can produce some chemicals to protect themselves from _____ hurt.(be)
【单选题】. --- This kind of food is said to contain poisonous chemicals. --- So why not _____ it?
A.
murder
B.
arrest
C.
boycott
D.
abolish
【单选题】Some boys took chemicals like soda and iodoform. powder because ______.
A.
they liked to set up stalls in the marked and sell things, like traders
B.
they were too poor to buy things like soap and medicine
C.
they wanted money and could sell such things quickly
D.
they needed things like soap and medicine for sores
【简答题】Some polluted waters are still beautiful because pollutants such as chemicals are hard to ______.
【单选题】A big difference between Kojo and Sorie was that ______.
A.
Kojo took chemicals for some useful experiment but Sorie only wasted his in making an alcoholic drink.
B.
Sorie was rich but Kojo was poor
C.
Kojo had a guilty conscience but Sorie did not
D.
when Kojo objected, Sorie proved that what they were doing was reasonable
【单选题】Food poisoning can be caused by all the following EXCEPT________.
A.
some chemicals
B.
low temperatures
C.
some tiny living things
D.
certain natural materials
【简答题】WSK produces chemicals for use in the agricultural sector, some which are highly toxic in both liquid and gaseous states. They need to be safely stored on site after processing until they are shipped ...
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