—How could you be so rude as a walk in here in the middle of my class?
—________.(2011·四川，5)
| A．Nothing much | B．Nothing serious |
| C．Never again | D．Never mind |
34. ____ by the advances in technology, many farmers have set up wind farms on their lands.
| A．Being encouraged | B．Encouraging |
| C．Encouraged | D．Having encouraged |
33. Some people skip meals or eat only tiny amounts of food and may have conditions ______ rob the body of the nutrients ______ needs to grow and stay healthy.
| A．which…it | B．that…that |
| C．where…that | D．where…it |
32. Fireworks, ________ of gun powder or flash powder _______ in a tight paper tube, make the big flash or boom effect.
| A．consisting…wrapping | B．consisting…wrapped |
| C．consisted…wrapped | D．being consisted….wrapped |
31. In the past few years, research has suggested that Vitamin D may increase the level of serotonin（血清素）, one of the key neurotransmitters influencing our mood, and ________it helps to relieve mood disorders.
| A．that | B．where | C．what | D．Which |
30. Chinese must have the largest number of speakers, ________ ?
| A．mustn’t that | B．haven’t they |
| C．don’t they | D．doesn’t it |