根据材料内容选择最佳答案。

(  ) 11. The underlined word “them” in Paragraph 1 refers to ______.

A. scientists                       B. sea plants

C. sea animals                  D. coral reefs

(  ) 12. The colors of coral reefs come from ______.

A. the sunshine                     B. the ocean water

C. animals living in them      D. algae living in them

(  ) 13. Warm ocean ______.

A. kills algae                          B. kills corals

C. helps algae grow faster   D. helps corals grow faster

(  ) 14. The last paragraph mentions ______ ways coral reefs have been harmed.

A. two                             B. three

C. four                              D. five

(  ) 15. Which of the following is TRUE according to the passage?

A. Algae doesn’t like the sunshine.

B. It takes corals a long time to build a huge reef.

C. People have dropped dynamite into the ocean to catch corals.

D. People and pollution have harmed most of the Earth’s coral reefs.

四. 情景交际(每小题1分，共5分)

根据对话内容，在空白处填入恰当的单词、短语或句子，使对话完整、通顺。

A: Some Russian teachers are visiting our school tomorrow, and I’m going to welcome them. How do I do that?

B: You know, in Russia, people usually kiss (1) ________________ — left, right, left.

A: What! No. I didn’t know that. We Chinese often (2) ________________ and smile when we meet visitors, and sometimes we nod (点头) our heads. But we (3) ________________ kiss. Only parents and children do that.

B: That’s because people do different things in (4) ________________.

A: So what do people in the USA and in India usually do when they meet?

B: In the USA, some people shake hands, and some kiss or hug each other. In India people put their hands together and nod their heads.

A: And do you know what Maori (毛利人的) people in New Zealand do when they meet?

B: No. (5) ________________?

A: They touch noses!

B: Sounds strange.