大约()的入侵种能够成功地定居下来。 A.5%-15% B.5%-25% C.10%

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问题:

大约()的入侵种能够成功地定居下来。

A.5%-15%

B.5%-25%

C.10%-15%

D.10%-25%

考点:生态学全球变化生态学全球变化生态学题库
题型:单项选择题
阅读理解。
     Birthdays are celebrated all over the world. Some ways to celebrate birthdays are rather similar from
country to country: candles, cakes and birthday wishes. But there also different ways to celebrate birthdays.
Here are a few:
                                                                  Denmark
     A flag is flown outside a window to show that people in that house are having a birthday. Presents are
placed around the child's bed while he is sleeping so he will see them at once when he wakes up.

                                                                    India
     Usually Indian children wear white to school. However, on their birthday children wear colored clothes
to school and give out chocolates to everyone in the class. Their best friend helps them to do this.

                                                                     Japan
     The birthday child wears new clothes to mark the special time. Certain birthdays are more important
than others. These are the third and seventh birthdays for girls and the fifth for boys.

                                                                Holland
     The birthday child receives an especially large present. The family also put flowers on the birthday
child's chair to make it beautiful.
1. When someone is having a birthday in Denmark, you can see _____ outside the window.
A. flowers
B. presents
C. a flag
D. a chair
2. In _____ flowers are put on the chair of the birthday child.
A. Japan
B. Denmark
C. India
D. Holland
3. In _____, only birthday children wear colored clothes to school.
A. India
B. Holland
C. Denmark
D. Japan
4. In Japan, the birthday is more important for boys when they are _____.
A. 15
B. 7
C. 5
D. 3
5. The passage is mainly about _____.
A. similar ways of celebrating birthdays in some countries
B. different ways of celebrating birthdays in some countries
C. children's birthdays in western countries
D. the importance of children's birthdays
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长方形和正方形都是轴对称图形,长方形有______条对称轴,正方形有______条对称轴.

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在( )m以下高度进行工作时,可使用牢固的梯子或高凳。

A.2
B.3
C.4
D.5

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