B.我们常用or连接两种供选择的情形. 查看更多

 

题目列表(包括答案和解析)

炭疽病由炭疽杆菌引起,炭疽杆菌感染人体后能产生两种极厉害的毒素——致死因子和水肿因子,使动物和人致病或死亡。结合下列人体免疫过程图解回答问题:
(1)炭疽杆菌感染人体后,其产生的毒素能刺激体内产生__________,将其消灭,这种物质的化学本质是__________,这种免疫方式属于____________免疫。
(2) 当毒性极强的炭疽芽孢杆菌第一次进入人体之后作为            
起作用,使其体内产生了具有免疫力的物质,与该物质产生有关
的细胞有吞噬细胞、____________、_____________和__________。
(3) 若多种病原体进入体内都能直接被吞噬细胞吞噬而消灭,这属于___________免疫。有些毒性很强的病原体经过上述过程不能被清除,只是将其__________________暴露出来,呈递给记忆细胞,使之迅速增殖分化为效应B细胞或效应T细胞,如果病原体是胞内寄生菌,则要通过_____________免疫的方式才能将其消灭。记忆细胞对抗原的记忆、识别和免疫等是依赖于细胞膜上的_______________实现的。
(4) 若病毒等侵入T细胞并使之大量死亡,使人丧失免疫功能,导致各种传染病的发生,这属于获得性________________病。

查看答案和解析>>

(2011江苏无锡,28,10分)(本题满分10分)十一届全国人大常委会第二十次会议审议的个人所得税法修正案草案(简称“个税法草案”),拟将现行个人所得税的起征点由每月2000元提高到3000元,并将9级超额累进税率修改为7级,两种征税方法的1~5级税率情况见下表:


现行征税方法
草案征税方法
月应纳税额x
税率
速算扣除数
月应纳税额x
税率
速算扣除数
1
x ≤ 500
5%
0
x ≤ 1 500
5%
0
2
500<x≤2 000
10%
25
1 500<x≤4 500
10%
 
3
2 000<x≤5 000
15%
125
4 500<x≤9 000
20%
 
4
5 000<x≤20 000
20%
375
9 000<x≤35 000
25%
975
5
20 000<x≤40 000
25%
1375
35000<x≤55 000
30%
2 725
注:“月应纳税额”为个人每月收入中超出起征点应该纳税部分的金额。
“速算扣除数”是为了快捷简便计算个人所得税而设定的一个数。
例如:按现行个人所得税法的规定,某人今年3月的应纳税额为2 600元,他应缴税款可以用下面两种方法之一来计算:
方法一:按1~3级超额累进税率计算,即500×5% + 1500×10% + 600×15% = 265(元)
方法二:用“月应纳税额×适用税率?速算扣除数”计算,即2600×15% ? 125 = 265(元)
(1)请把表中空缺的“速算扣除数”填写完整;
(2)甲今年3月缴了个人所得税1 060元,若按“个税法草案”计算,则他应缴税款多少元?
(3)乙今年3月缴了个人所得税3千多元,若按“个税法草案”计算,他应缴纳的税款恰好不变,那么乙今年3月所缴税款的具体数额为多少元?

查看答案和解析>>

阅读理解。
     The following is from Priory School-a British middle school about school uniform.
                                                  Priory School Uniform Rules
     Priory School uniform is simple, neat (整洁的) and practical. We have found that parents and students
appreciate our dress ideas below.
     Priory School uniform is produced in Wards, High Street, Lewes.
     Compulsory(必须的)for all years
     Shirt Either a white school shirt, or a simple white "polo"shin (no logos) (元商标) under the sweater.
     Trousers Black. "school uniform" type. Not jeans or fashion trousers.
     Skirt-girls Black, simple, knee-length regulation school skirt. (Not fashion wear.)
     Shoes Simple black leather (皮革的), or leather-like shoes with no patterns, colours, logos, or coloured
laces.
     Optional (可选择的)
     Sweatshirt A black sweatshirt with "Priory School" woven in it.
     Sweater A black fine-knit v-neck sweater with "Priory School" woven in it.
     T-shirt If students wish to wear a T-shirt under the school shirt, it must be simple white; no ron-neck
sweaters should be worn.
     Coat Coats should NOT be worn in school.
     Socks Black, grey or white. Girls may wear black or grey warm tights in cold weather.
     Jewellery None except very small sleepers (小耳环), one for each ear-for safety reasons. Rings sets of
earrings, large earrings, nose, tongue and eyebrow rings must not be worn. No jewellery may be worn during
PE, or similar lessons.
     Clothes of famous logos should not be brought to school.
     All students are expected to be arrive with the correct dress for PE lessons. Health and Safety orders NO
jewellery of any kind to be worn. This includes any form of body piercing.
     To help make clear our expected dress ideas, designs anti models can be viewed on the school website
www.priory.e-sussex.sch.uk
1. What's the parents' attitude towards Priory School uniform ideas?
A. They agree.
B. They don't agree.
C. They are not sure.
D. We are not sure
2. "Lewes" in the passage above is probably the name of _____.
A. a head teacher of the school
B. a producer or a company
C. a middle school
D. a city or a town
3. Which is a proper costume for a student in Priory School?
A. A white shirt,jeans and black shoes.
B. A pink T-shirk a black skirt and grey socks.
C. A white T-shirk black trousers of "school uniform" type and very small earrings.
D. A coat trendy black trousers and black leather shoes.
4. The students in Priory School can wear _____ in PE lessons.
A. a school shirt
B. rings
C. nose piercing
D. Adidas sports shoes
5. According to the instructions above, if you want more information about the school uniform, you can _____.
A. make a telephone
B. surf the Internet
C. send an email
D. write a letter

查看答案和解析>>

在下列每小题内,你将听到一个或两个句子并看到供选择的A、B、C三幅图画。
找出与你所听到句子相匹配的图画。
(     )1. A.      B.       C.
(     )2. A.            B.   C.
(     )3. A.        B.     C.
(     )4. A.  B.         C.

查看答案和解析>>

根据提示,写一篇60—80 词的小短文。 短文要求达意,正确,连贯,可以适当补充。

提示:五年前我家只有一间小屋,三个人住一间小屋很是艰难。 现在我们已经搬入两室一厅的房子,我非常高兴。 我爱我家。

____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

查看答案和解析>>


同步练习册答案