第1题
But water, natures most essential element, is becoming increasingly______.
A.barren
B.absent
C.critical
D.scarce
第3题
The second paragraph uses facts to develop the essential idea that ______.
A.a plant efficiently utilizes most of the water it absorbs
B.carbon dioxide is the essential substance needed for plant development
C.a plant needs more water than is found in its composition
D.the stronger the wind, the more the water vapor loss
第4题
The essential function of photosynthesis in terms of plant needs is ______ .
A.to derive energy from light
B.to preserve water
C.to combine carbon dioxide with water
D.to form. sugars
第6题
The essential function of photosynthesis in terms of plant needs is______
A.to form. sugars
B.to derive energy from light
C.to preserve water
D.to combine carbon dioxide with water
第7题
Water is an essential global resource and it is up to each of us to ______ it.
A.preserve
B.maintain
C.reserve
D.conserve
第8题
Water is an essential global resource and it is up to each of us to ______ it.
A.preserve
B.maintain
C.reserve
D.conserve
第9题
The essential function of photosynthesis in terms of plant needs is ______.
A.to derive energy from light
B.to preserve water
C.to combine carbon dioxide with water
D.to form. sugars
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