臭氧层是地球生物的保护层,可以减少太阳辐射中紫外线对生物的伤害。()
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A.businessB.schoolC.exerciseD.speech
A. business
B. school
C. exercise
D. speech
氮循环的主要生化过程包括固氮作用、硝化作用、反硝化作用和氨化作用。()
A. 正确
B. 错误
A.acquireB.convenientC.admireD.anxiety
A. acquire
B. convenient
C. admire
D. anxiety
A.roughB.daughterC.delightD.through
A. rough
B. daughter
C. delight
D. through