[单项选择]Pet animals live in millions of American homes. People keep cats, dogs, birds, fish, guinea pigs, mice -- ______ snakes.
A. and
B. together with
C. even
D. but not

[单项选择]The grass_____ many animals live is abundant here.
A. by which
B. with which
C. on which
D. of which

[单项选择]The grass ______ many animals live is abundant here.
A. by which
B. with which
C. on which
D. of which

[单项选择]

Have you ever wondered why different animals or pests have their particular colors Colors in them seem to be used mainly to protect themselves.
Birds, especially seagulls, are very fond of locusts, but birds cannot easily catch locusts because locusts change their colors together with the change of the color of crops. When crops are green, locusts look green. But when crops are ripe, locusts take on exactly the same brown color as crops have. Some other pests with different colors from plants are usually easily found and eaten by their enemies. So they have to hide themselves in terror for lives and appear only at night.
If you study the animal life in any part of the world, you will find the main use of coloring is to protect themselves. Bears, wolves and other beasts move quietly through forests. They are usually invisible to the eyes of hunters, because they have the color much like the barks of trees.
An even more strange act remains to be noticed. A
A. the change of color in locusts
B. the protective coloration of animals and pests
C. how a certain sea fish protects itself
D. animals or pests can dye themselves different colors

[单项选择]Small animals are said to live faster because they______.
A. have more skin for their weight
B. bum fuel faster than big ones
C. replace lost heat faster
D. keep a high body temperature

[单项选择]Small animals are said to live faster than big ones because they ______.
A. have more skin for every ounce of body weight
B. replace lost heat faster
C. bum fuel faster
D. maintain a higher body temperature

[单项选择]Animals, including man, can live six times longer than their normal period of growth.
A. 动物和人一样，存活的时间是他们通常的成K期的6倍。
B. 动物和人一样，存活的时间比他们通常的成长期要长6倍。
C. 动物，包括人，存活的时间比他们通常的成长期要长6倍。
D. 动物，包括人，存活的时间是他们通常的成长期的6倍。

[单项选择]FAUNA : ANIMALS::
A. (A) flora : plants
B. (B) vegetation : aboriginals
C. (C) fowl: amphibians
D. (D) livestock: oxen
E. (E) department : professors

[单项选择]What are the ways animals communicate


A. Words.
B. Gesture and posture.
C. Facial expressions.
D. Special signals.

[单项选择]Practically all animals communicate either through sounds or through soundless codes.
A. Certainly
B. Probably
C. Almost
D. Absolutely