贾母到栊翠庵，妙玉用什么茶招待这位老祖宗的？

若载重3t的卡车有x辆，载重5t的卡车比它多4辆，它们一共运货yt，那么x、y的关系式为（    ）。

金融债券按照利率确认方式不同，可以分为（）。

A．短期债券和长期债券 

B．固定利率债券和浮动利率债券 

C．零息债券和附息债券 

D．零息债券和到期一次还本债券

有唐氏综合征（第21号染色体是3条）的女人同正常男人结婚，其后代将是怎样？

下列对放射性物质的半衰期，描述正确的是（）。

A.半衰期是用来表示放射性物质衰变快慢的物理量

B.所有放射性物质的半衰期都是相同的

C.半衰期长的放射性物质运输要优先于半衰期短的放射性物质

Recently, I flew to Las Vegas to attend a meeting. As we were about to arrive, the pilot announced with apology that there would be a slight (16) before setting down. High desert winds had (17) the airport to close all but one runway. He said that we would be (18) the city for a few minutes waiting to (19) . We were also told to remain in our seats meanwhile with our seat belts fastened (20) there might be a few bumps(颠簸). Well, that few minutes turned into about four-five minutes, including a ride that would make a roller coaster(过山车) (21) by comparison. The movement was so fierce that several passengers felt (22) and had to use airsickness bags. As you might guess, that’ s not a good thing to have happen in a(n) (23) space because it only (24) to increase the discomfort of the situation.

About twenty minutes into the adventure, the entire airplane became very (25) There was now a sense of anxiety and fear that could be (26) noticed. Every passenger simply held on for dear life …except one. A (27) was having a good time！ With each bump of the (28) , he would let out a giggle (咯咯地笑)of delight. As I observed this, I (29) that he didn’t know he was supposed to be afraid and worried about his (30) . He neither thought about the past nor about the future. Those are what we gown--ups have learned from (31) . He was (32) the ride because he had not yet been taught to fear it. Having understood this, I took a deep breath and (33) back into my seat, pretending I was (34) on a roller coaster. I smiled for the rest of the flight. I even (35) to giggle once or twice, much to the chagrin(随恼) of the man sitting next to me holding the airsickness bag.

（22）（）

A．sick

B．nervous

C．angry

D．afraid