The scientists are interested in studying tree rings because they can tell______.
A. whether in that area the climate was healthy or not
B. whether a particular tree was healthy or not
C. whether people, took good care of the trees or not
D. how old the trees were
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It is a fact that______.
A. oil is getting less and less
B. the future is terrible with such a serious problem
C. the government tries to solve the problem within several years
D. the country will soon use up energy if we keep wasting like this
The price of fruit has increased recently ______the price of vegetables has gone down.
A. when
B. whether
C. whereas
D. otherwise
Some members of the staff couldn't handle Murray's condition, hard ______they tried.
A. as
B. although
C. when
D. even if
The people had to leave the region of New Mexico because______.
A. they had cut down all the trees
B. there were many trees there
C. they had no water
D. bad weather stopped the growth of trees
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