更多"Crocodiles (鳄鱼) lay their eggs and "的相关试题:
[单项选择]Crocodiles (鳄鱼) lay their eggs and leave them under leaves or sand. Baby crocodiles have special sharp teeth with which to break their way out of the shells.
Crocodiles only live where it is hot. They are found in India, Australia, Africa and America. They spend most of their time lying around in the mud or the rivers. The crocodile’s long powerful tail is used when the animal is swimming. It is also an excellent weapon, because it can be swung with great speed and force. One blow will knock down a man or even a big animal at once. The crocodile is very well protected against its enemies by the hard bony plates which cover most of its body, but because of the way its neck is formed, it cannot turn its head from side to side and so it can only see in front of itself. The crocodile has its teeth cleaned by the crocodile bird. For its food this bird takes the bits left in the crocodile’s mouth. This helps the crocodile, which cannot clean its own teeth, for it cannot move its tongue
A. over the water
B. beside the water
C. under the water
D. on the water
[填空题]Crocodiles lay their eggs and leave them under leaves or sand. Baby crocodiles have special (36) teeth with which to break their way out of the (37) .
Crocodiles only live where it is hot. They are found in India, Australia, Africa and America. They spend most of their time (38) around in the mud or the rivers. The crocodile’s long (39) tail is used when the animal is swimming. It is also an excellent (40) , because it can be swung with great speed and (41) . The crocodile is very well (42) against its enemies by the hard bony plates which (43) most of its body, but because of the way its neck is formed, (44) . With its rows of terrible pointed teeth it seizes its food, which may be a fish, an animal, or even a careless man, and (45) .
The long-nosed crocodile is shy and timid and because of this, the people of West Africa where it lives, sometimes catch it for food.
[单项选择]Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae. Which of the following conclusions can properly be drawn from the information above
A. The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp’s egg-laying behavior.
B. Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.
C. Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.
D. Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs.
E. (E) Parasitic wasps use visual clues to calculate the size of host egg.
