【名词&注释】
亚硝酸钠(sodium nitrite)、实际生活(real life)、中国学生(chinese students)、化合价(valence)、地球表层(earth surface)
[单选题]板块构造学说的观点认为地球表层(earth surface)可划分为： （ ）
A. 四大板块
B. 五大板块
C. 六大板块
D. 七大板块
查看答案&解析
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举一反三：
[单选题]亚硝酸钠（NaNO2）是一种工业用盐，外观酷似食盐，人若误食，会引起中毒。亚硝酸钠中氮元素的化合价是（ ）
A. +1
B. +3
C. +4
D. +5
[单选题]48．
A. my
B. his
C. their
D. your
[单选题]18．
A. came
B. went
C. introduced
D. visited
[单选题]A place is moved from day into night and from night into day over and over by ______ of the earth.
A. the pushing
B. the pulling
C. the spinning
D. the passing
[单选题]—Wouldyouliketogototheconcertwithme?—I’dloveto,________I’mafraidIhavenotime.
A. so
B. or
C. and
D. but
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