What can we learn from the passage？
A. People can hardly get Vitamin D from daily diet.
B. Heavy use of sunscreen can promote the Vitamin D production by the body.
C. The Vitamin D density is strengthened in milk and bread.
D. The standard amount of Vitamin D intake keeps no change for kids and adolescents.
A．deviateB．fluctuateC．differentiateD．segregate
A. deviate
B. fluctuate
C. differentiate
D. segregate
When enough of the tree ______chopped away, the tree falls.
A. is
B. have
C. was
D. were
人才是乡村振兴的第一资源。乡村振兴既要留得住绿水青山，还要留得住人才。()
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