(12分)如图所示，足够长的光滑斜面的倾角为37°，质量分别为mA和mB的A、B

阅读理解。

     This is a book. It's an English book. It is my English book. That is a

dictionary. Is it Lucy's dictionary? No, it isn't. It's Tom's dictionary. Her

dictionary is in her bag. Look! What are these? They're pens. Are they

Tom's pens? No, they aren't. They are Mike's.

1. What's this? It's _______________.

2. What's that? It's _______________.

3. Is it Tom's dictionary? _______________.

4. Where is her dictionary? ______________.

5. Whose pens are those? ________________.

在Foxmail中查看邮件的方式是（）。

A.在收到的邮件上单击鼠标右键

B.在收到的邮件上单击鼠标左键

C.双击鼠标

D.单击鼠标

发动机配气机构的异响之一是（）

A.汽油牌号不当

B.活塞敲缸响

C.气门脚响

D.燃烧室积炭

佛教在经新疆传入中原的过程中，沿途修建了许多石窟，形成了艺术史上独具特色的石窟艺术。新疆克孜尔石窟壁画中的飞天和菩萨是全裸的；而在敦煌莫高窟中全都穿上了裙子，至多半裸上身；在洛阳龙门石窟中就全穿上宽袍大袖的衣服了。这种服饰上的变化反映了（）

A.沿途气候逐渐变得寒冷

B.洛阳地区社会风气最为保守

C.中原地区的经济较之边疆地区更为发达

D.越接近汉文化中心，本土化特点越显著

向公用电网注入谐波电流或在公用电网中产生谐波电压的电气设备叫（）。

A.谐波；

B.基波；

C.畸变率；

D.谐波源。