1根据对话内容，从方框内的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。

Mrs. Lee: Hello. 68178502.

David:  Hello.   1.   ?

Mrs. Lee: Sorry.   2.  . Can I take a message??

David:  Yes. This is David, Bruce’s friend. I want to ask him for some Chinese ancient coins. He told me he had got some recently.   3.   . I don’t care if they were made of different metals. I just want to add some more coins in my collection.

Mrs. Lee: OK. I’ll tell him. Would you like him to ring you back later?

David:  Well, I won’t be at home later this day. Would you please ask him to ring me tomorrow morning??

Mrs. Lee: Sure.  4.  ?

David:   Oh, sorry.   5.  .  The new number is 66129853.

Mrs. Lee: OK. I’ll write a message for him.

David:   It’s really nice of you, Madam. Thank you very much. Goodbye!

Mrs. Lee:  Bye!

The world’s population has reached 7 billion（十亿）according to the United Nations（联合国）by 2011. It comes just 12 years since the total reached 6 billion - with official estimates saying the population will top 8 billion in 2025 and 10 billion before the end of the century.
And it is most likely that the 10-billionth baby will be born in the Asia-Pacific region - where the population growth rate is higher than anywhere else in the world.
Of the 2.3 billion people, the United Nations believes will be added by 2050, more than 1 billion will live in sub-Saharan Africa. The Indian subcontinent（次大陆）will add some 630 million people.

With more people to feed, more houses & medical care to provide, experts say the world’s resources（资源）will face more strain than before.
【小题1】According to the picture, the population of the world reached 6 billion in ________.
A. 1987                     B. 1999                     C. 2011
【小题2】We know that more than 1 billion will live in  _______ by 2050.
A. sub-Saharan Africa
B. Indian subcontinent
C. the United States
【小题3】According to the picture, _______ will have the largest population in 2050.
A. China                        B. India                        C. Nigeria
【小题4】The underlined word “strain” in the last paragraph（段落）means “_________”.
A. 破坏                     B. 关闭                     C. 压力
【小题5】The population of the world grows ________ according to the picture.
A. slower and slower
B. faster and faster
C. smaller and smaller

用所给单词的正确形式填空（每个单词只能用一次）。（每个1分，共10分）