关于胚泡结构的描述，错误的是（） A.胚泡内含液体的腔，称为胚泡腔 B.周围的细胞排

发布时间：2017-08-19 11:55 │ 来源：www.tikuol.com

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问题：

关于胚泡结构的描述，错误的是（）

A.胚泡内含液体的腔，称为胚泡腔

B.周围的细胞排列成单层，称为滋养层

C.胚泡一端内面的一团细胞，称为内细胞群

D.又称桑椹胚

E.内细胞群外面的滋养层，称为极端滋养层

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完形填空。

     Napoga Gurigo is a 12 -year- old girl in Ghana, Africa. It is    1   for her family to get clean water. The
nearest place to get water is a dirty hole half a kilometer from their    2   .
     Every morning, Napoga    6   home at half past five to get water for her family. Sometimes it    4   six
hours to get enough clean water. Napoga has no time to go to school    5   play with her friends. Millions of
people in the world are like Napoga. They can't get enough clean water to    6   healthy. Most of those people
are in Africa. Water covers 70 per cent of the Earth's surface. But most of that is sea water. We can't use it
for drinking or cooking. Fresh water is    7   we use to drink, take showers and cook food. But fresh water
    8   only 1 per cent of the Earth's surface.
     Many people have made wells to get clean water from     9   . But there still isn't enough. Scientists say
that in 30 years, more than half of the people in the world    10   have enough clean water.

(    )1. A. easy
(    )2. A. school
(    )3. A. goes
(    )4. A. spends
(    )5. A. and
(    )6. A. keep
(    )7. A. that
(    )8. A. takes
(    )9. A. under the surface
               of the ground
(    )10. A. won't

B. hard
B. city
B. stays
B. costs
B. or
B. get
B. /
B. runs
B. above  the surface
   of the ground
B. will

C. fun
C. country
C. leaves
C. pays
C. but
C. have
C. what
C. flows
C. the rivers

C. can

D. impossible
D. village
D. comes
D. takes
D. while
D. do
D. when
D. covers
D. the sea

D. can't

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题型：单项选择题

草酸是二元弱酸，草酸氢钾溶液呈酸性。在0.1mol·L^-1 KHC₂O₄溶液中，下列关系正确的是[ ]

A．c(K⁺)+c(H⁺) = c(HC₂O₄^-)+c(OH^-)+c(C₂O₄^2-)

B．c(HC₂O₄^-)+c(C₂O₄^2-) = 0.1 mol·L^-1

C．c(C₂O₄^2-) < c(H₂C₂O₄)

D．c(K⁺) = c(H₂C₂O₄)+c(HC₂O₄^-)+c(C₂O₄^2-)

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题型：单项选择题

《茶花女》是意大利著名歌剧作曲家（）的作品。

A.威尔第

B.普契尼

C.罗西尼

D.唐尼采蒂

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题型：单项选择题

克山病的预防措施有（）。

A.治理生态环境，提高环境中硒水平

B.消除诱发因素，注意防寒感染

C.提倡合理营养，科学平衡饮食

D.科学合理补硒，如硒盐硒粮

E.以上答案都正确

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题型：单项选择题

在Visual FoxPro中，为了建立参照完整性，首先必须建立表之间的【】。

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