“高声呼叫”反映了声音的很大,“买西瓜时，拍拍西瓜就知道瓜的

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问题填空题

“高声呼叫”反映了声音的很大,“买西瓜时，拍拍西瓜就知道瓜的好坏”是依据声音的。

答案

响度，音色

“高声呼叫”是声音特别大，指的是响度这一特征；因为不同发声体的材料、结构不同，发出声音的音色不同，所以西瓜生熟不同，发出声音的音色也不同．

阅读理解

阅读理解。

The sun is very bright (明亮的). Light (光) from the sun helps us see things Its light also makes

our green grass and trees grow.

The sun is very hot. It makes air warm. Then we are warm.

When the day is over, the sun goes down (落下). It is night. But the next day the sun comes up

(升起). It is bright again. A new day begins.

1. Sunlight makes grass and trees .

A. fall down

B. turn cold

C. glow

2. You can tell that nights are than days.

A. better

B. longer

C. colder

3. This article (文章) tells about .

A. the sun

B. playing outside

C. the dark night

4. When the day is over the sun _____.

A. comes up

B. goes down

C. gets brighter

5. The sun makes air .

A. warm

B. cold

C. hot

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Yd，11接线的变压器对差动保护用的电流互感器有什么要求？