What does the word “this” underlined in the third paragraph refer to?

A．We will lose much more than we can gain．

B．Humans have begun destroying rainforests．

C．People have a strong desire for resources．

D．Much carbon dioxide comes from burning rainforests．

据人口年龄，性别结构判断，文化教育在城市服务功能中占主要地位的量

A．a

B．b

C．c

D．d

我国积极开展多边外交，努力发展同发达国家的关系，全面深化同周边国家的睦邻友好关系，大力加强同发展中国家的团结合作。我国外交政策的宗旨是

A．独立自主B．和平共处五项原则

C．维护世界和平、促进共同发展

D．维护我国的独立和主权，促进世界的和平与发展

51_______.

A.understand

B.explain

C.believe

D.question

Which of the following helps to develop traditional customs?

A. The special role of oxen in farming.

B. People's respect and love for oxen.

C. The practical value of an ox's body.

D. The contribution of oxen to the economy.

He had lost his temper and his health in the war and never found _________of them again.

A.neither

B. either

C. eath

D.all