I used to feel very nervous when I stood

题型:选择题

问题:

I used to feel very nervous when I stood up in front of others, but now I feel quite ______when giving a speech to the school.

A.at random

B.at length

C.at ease

D.at sight

考点:介词和介词短语
题型:选择题

2,5,11,20,32,( )。

A.43

B.45

C.47

D.49

题型:选择题
     从方框A-----G中选出可以填入对话空白处(1----5)的最佳选项,并将其字母序号填入题前的
括号内。选项中有两项为多余选项。
A. And what should I see there?
B. Of course not.
C. What else?
D. Anytime.
E. Sure I can.
F. Would you like to go somewhere?
G. It's very interesting .
A: Can you tell me a little about Mexico City ?
B: 1________ What would you like to know ?
A: Well, what's a good time to visit ?
B: 2________ The weather is always nice .
A: Oh, good! 3________
B: Well, you should visit the National Museum and go to the Palace of the Fine Arts.
A: 4________ 
B: Oh, you shouldn't miss the Pyramid of the Sun. 5________
A: It all sounds really exciting.
题型:选择题
李大伯有一片果林,共80棵果树,某日,李大伯开始采摘今年第一批成熟的果子,他随机选取2棵果树共摘得果子,质量分别为(单位:kg):0.28,0.26,0.24,0.23,0.25,0.24,0.26,0.26,0.25,0.23,以此计算,李大伯收获的这批果子的单个质量和总质量分别约为(  )
A.0.25kg,200kgB.2.5kg,100kg
C.0.25kg,100kgD.2.5kg,200kg
题型:选择题

世界上第一支真正的自动枪是马克沁机枪,它是1883年由()工程师马克沁制造的,其射速为()发/分。

题型:选择题

某种淋巴细胞能够分泌一种称为穿孔素的蛋白质。穿孔素可将被病毒感染的细胞或肿瘤细胞的膜溶解而形成孔洞,导致该细胞解体死亡。下列有关说法不正确的是()

A.效应T细胞能识别靶细胞与细胞膜上的糖蛋白有关

B.指导穿孔素合成的基因在浆细胞中也存在

C.穿孔素是淋巴细胞分泌的一种抗体

D.淋巴细胞分泌穿孔素的过程要依赖膜的流动性

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