[单项选择]So little （）about mathematics that the lecture was completely beyond me
A. I know    
B. I knew     
C. did I know  
D. do I know

[单项选择]So little （）about mathematics that the lecture was completely beyond me.
A. I knew
B. do I know
C. did I know
D. have I known

[单项选择]So little （　） about mathematics that the lecture was complete beyond me.
A. I know
B. do I know
C. I knew
D. did I know

[单项选择]So little （） about chemistry that the lecture was completely beyond me.
A. did I know
B. I know
C. do I know
D. I knew

[单项选择]So little（）about physics that the lecture was completely beyond me.
A. I knew
B. did I know
C. I had known
D. had I known

[单项选择]So little （） about physics that the lecture was completely beyond me.
A. I knew
B. did I know
C. I had known
D. had I known

[单项选择]So little ______ about mathematics that the lecture was completely beyond me.
A. I knew
B. do I know
C. did I know
D. have I known

[多项选择]The lecture talks about negative influences of advertisement to the environment.

[填空题]Today’s lecture is about the mass (1) of the world’s population. There are two major (2) why people are moving to cities. The first reason is (3) . People are moving to the cities because that’s where they can find (4) and earn money. The second reason for the move to cities has to do with (5) of life issues: comfort and (6) . Cities often offer better (7) . And then for many, city life is just more (8) . An interesting consequence of urbanization is that the average (9) of people in the countryside is increasing, while that of the cities is (10) .
Three key (11) can be identified in our cities. First of all, they’re getting bigger. Most cities are bigger now than ever before. Cities are also changing shape. They’re getting (12) , because land is getting more and more expensive. (13) have become a symbol of modern cities.
Cities are al