毕竟所有的生物都靠吃其他东西生存，不管这种东西是植物还是动物，是死的还是活的。

问答题食草动物没有草不能生存，食肉动物没有猎物无法活命，植物没有一定的基本化学物质或一定的土壤就生长不了。

单项选择题第（4）空应选择（）

A. worried
B. satisfied
C. proud
D. curious

单项选择题According to paragraph 4, the author and her friend（）.

A. call each other regularly

B. have similar personalities
C. enjoy writing to each other
D. dream of meeting each other

单项选择题What is the theme of the cartoon（）

A. We should always listen to our parents.
B. Parents should let their children have an independent life.
C. Parents should take care of their children in ease they get lost.
D. Parental love is the greatest love in the world.

单项选择题We can infer from the passage that（）.

A. abstract thinking does not come from physical experiences
B. feelings of warmth and coldness are studied worldwide
C. physical temperature affects how we see others
D. capable persons are often cold to others