The questions of one lesson and four exercises in the first science of junior high school, and the a

1.Among the following common animals, the most complex and functional is (d).

a crucian carp, b frog, c sparrow, d rat.

2.Among the following items, those that belong to amphibian characteristics are (fill in the serial number).

The body is covered with scales or hairs; **Moist; Oviparous; The larvae live in water and breathe with their gills; Adults breathe with lungs, combined with **; Spawning in water.

3.Most birds are beneficial birds, for example, birds that eat about the same amount of pests as their own body weight every day and night are beneficial birds

4.The most important part of the structure of a flower is (b).

A corolla b stamen c petal d ovary.

5.What we usually mean by green flowering plants is (a).

a angiosperm b gymnosperm c seed plant d all plants.

6.The fruit is composed of two parts: the seed developed from the ovule in the ovary and the pericarp developed from the ovary wall.

7.From the hierarchical point of view, the basic unit of taxonomy is species. The lower the taxonomic level, the more organisms are included in common, and the fewer species of organisms there are. Organisms of the same class and different orders have less in common than organisms of different genera of the same family.

3.Woodpecker.

6.Kernel, peel (flesh).

Forgot, there should be in the book, the last 1, 2More than 3Less 4Few.

Give points quickly.

First of all, you should know that any number, divided by 2 (or any power of 2), can be divided.

And 24 = 3*8, 8 is the power of 2.

So this problem is equivalent to, 1 is divisible by 3 (I omit the decimal point and treat it as a three-digit number, which does not affect the calculation).

The nature of a number divided by 3: the sum of all digits should be an integer multiple of 3.

This question cannot be repeated, so just find the sum of two from 0, 2, 3, 4, 5, 6, 7, 8, 9 and add 1 to be an integer multiple of 3.

They are: 0,2; 0,5； 0,8； 2,3； 2,6； 2,9； 3,5； 3,8； 4,7； 5,6； 5,9； 6,8； 8,9；

There are 13 pairs, and each pair can be used twice (swapping positions), so there are 13*2=26 decimals.

You send us a problem that you don't know, and they'll help you solve it.

Too lazy to write, don't write the question.

If you don't write the topic, you can't be lazy.

3 cubic meters 10500000

The storage room is exactly the size of 1,000 leather shoeboxes.

The theory is to put down, but in practice, it is not possible to consider the way to put the shoes.

The top angle connecting the midpoint of each side and the opposite side is a square of 80 square centimeters.

You have to give points!

Can you write down the title? Or what the title is.