键18×100GB、1096—79表示圆头平键的（）。A、键宽为18mm、键长为10

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问题单项选择题

键18×100GB、1096—79表示圆头平键的（）。

A、键宽为18mm、键长为100mm

B、键宽为18mm、键长为1096mm

C、键高为18mm、键长为100mm

D、键高为18mm、键长为1096mm

答案

参考答案：A

阅读理解

阅读理解。

Doing experiments can be interesting, and you may try the following experiments at home.

Make sure that you’ll do them with an adult.

1. How many experiments are there in the pictures?

A. Six.

B. Five.

C. Three.

D. Two.

2. The following are the instructions on how to do “Step 2” in these experiments. Which one is the right order?

a. Pour 3/4 of the water away. b. Put a balloon on the bottle.

c. Put the bottle in a bucket of hot water. The air rises into the balloon.

A. a, b, c

B. a, c, b

C. b, a, c

D. c, a, b

3. What can you see in the bottle at last in Experiment A?

A. Some ice.

B. Some water.

C. Some ice and water.

D. A cloud and some water.

4. What will happen to the balloon in “Step 3” in Experiment C?

A. It will be bigger.

B. It will be broken.

C. It won’t change.

D. It will be in the bottle.

美国黑人运动领袖马丁·路德·金演讲词：“一位伟大的美国人签署了《解放黑奴宣言》，我们现在就站在他的纪念堂前”。这位“伟大的美国人”是:( )

A．华盛顿

B．罗斯福

C．林肯

D．杜鲁门