tation, thereby helping to prevent erosion and regulate the flow of streams.
(A) to the soil
(B) the soil
(C) where the soil
(D) the soil is
狗屎
16. Modern societies are such complex that they could not exist without
A B C
a well-developed system of law.
D
17. Altitude, climate, temperature, and the length of the growing season both
A B C
determine Where plants will grow.
D
18. The bathyscaphe, a free-moving vessel designed for underwater exploration,
A
consists of a Flotation compartment with a observation capsule attached underneath it.
B C D
19. Water constitutes almost 96 percent of the body weight of a jellyfish, so if
A B
a jellyfish were to dry out in the sun, it would virtually disappeared.
C D
20. The most important parameters affecting a rocket's maximum flight
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