41. 可以利用的 _______________ 42. 把…加上 __________________
|
have fun,
break down,
depend on,
make up of,
available to,
a variety of,
give off, be
sensitive to, range
from, contribute to, take advantage of |
Life in the oceans ________________ the tiniest plankton to giants like sharks and whales. What makes the ocean such a great place to live? The answer is water. The chemical structure of water make it an excellent medium for life. The water molecule _______________ two hydrogen atoms and one oxygen atom. Water can _______________ both solids and gasses. The nutrients in whatever falls into the ocean quickly become _______________ other living creatures. Marine animals and plants _______________ the density of water. With the right kind of body, they can float in the water. Water can absorb and _______________ a lot of heat without big changes in temperature, so the ocean is a safe and comfortable habitat for marine life.
An estuary is the body of water where a river meets the ocean. Estuaries _______________ environmental pollution, so protecting them is very important. Estuaries provide both recreation and education for human beings. We may _______________ there and also we may have endless opportunities to study _______________ life in this habitat. Estuaries also _______________ the economy through tourism and fishing.
We must protect water and use it wise, because our future _______________ it.
Unit 15 -16