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【单选题】
下列选项中正确的是 [ ]A.
命题p： ，tanx 0 =1；命题q： ，x 2 -x+1＞0，则命题 是真命题
B.
集合M={x|x 2 ＜4}，N={x|x 2 -2x-3＜0}，则M∩N={x|-2＜x＜3}
C.
命题“若x 2 -3x+2=0，则x=1”的逆否命题为“若x≠1，则x 2 -3x+2≠0”
D.
函数f(x)=x 2 +2(m-2)x+4在[1，+∞)上为增函数，则m的取值范围是m＜1
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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】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
【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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