急性白血病时下述哪项是正确的（） A.急性粒细胞白血病常有齿龈_爱下问搜题

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问题单项选择题

急性白血病时下述哪项是正确的（）

A.急性粒细胞白血病常有齿龈肿胀、呈灰紫色

B.急性单核细胞白血病很少有发热症状

C.急性早幼粒细胞白血病出血症是明显的

D.急性红白血病贫血不很明显

E.急性淋巴细胞白血病淋巴结肿大是不常见的

答案

参考答案：C

阅读理解

阅读理解。

Have you ever seen a windsock blowing in the wind? Well, you can make one of your own! This is a fun
game that you can do with things you may have at home. You just need to follow a few easy steps.

You will need:
    ●one piece of colored paper
    ●five ribbons
    ●strong tape
    ●a string
    ●a pencil

What to do:
     Step 1: Decorate the paper. You can draw pictures on it. You can write your name. Do anything that will
make it special to you.
     Step 2: Roll the paper into the shape of a tube. Then stick the tube together at each end and in the middle
with a strong tape.
     Step 3: Use a pencil to make a hole into both sides of the tube. The holes should be only on one end of the
tube. Pull the string through both holes. Then tie the ends of the string together.
     Step 4: Make five holes around the top of the other end of the tube. Put a ribbon through each of the holes.
Tie firmly in case they get loose.
     Now your windsock is ready to use, but how does it work? Wind flows through the tube and makes it fly
and dance around. Hold the windsock up in the air by its string and run around. It will fly behind you. You can
also hang it outside and watch it dance around on its own!

1. Which of the following is needed for Step 2?

A. Ribbons.
B. Tape.
C. A pencil.
D. A string.

2. After which step will your windsock be like this?

A. Step 1.
B. Step 2.
C. Step 3.
D. Step 4.

3. Right after you put ribbons through the holes in the tube, you should _____.

A. tie the ribbons firmly
B. tape the tube together
C. make holes in the tube
D. draw pictures on the paper

4. Why does the author write this passage?

A. To tell an interesting story.
B. To teach an important lesson.
C. To give information about wind.
D. To explain how to make a windsock.

填空题案例分析题

右下图为某森林生态系统物质循环示意图，请据图回答：

生态系统碳的吸收主要是通过（）作用实现的，碳的释放主要是通过（）作用实现的。