晨光文具店有一套体育用品：1个篮球，1个排球和1个足球，一套售价300元，也可以

一个天然湖泊生态系统中，肉食性鱼总比草食性鱼的数量少得多。这是由于：

A．湖泊中鱼的密度太大

B．湖泊中氧气不足

C．水鸟叼走肉食性鱼苗过多

D．能量在食物链中逐级递减

下列哪一项不是Behcet病的表现（）。

A.Dalen-Fuchs结节

B.非肉芽肿性葡萄膜炎

C.视网膜血管炎

D.视网膜炎

E.玻璃体浑浊

句型转换

小题1: My father often helps in the house at the weekend. (改为一般疑问句)

______ your father often _________ in the house at the weekend?

小题2:My cousin Lucy has been away from home for five years. (改为同义句)

It’s five years _______ my cousin Lucy _______ home.

小题3:The work is hard enough for me to finish in such a short time. (改为复合句)

The work is ______ hard ______ I can’t finish it in such a short time.

小题4:Mr. Lu said, “ I have many good friends and a well-paid job in Beijing.”

(改为间接引语)

Mr. Lu said that _______ _______ many good friends and a well-paid job in Beijing.

小题5:The government will build a new school in my hometown. (改为被动语态)

A new school will ________ ________ in my hometown by the government.

手摇道岔时如何判定道岔密贴后，（）已经锁闭。

A、当摇不动时

B、道岔密贴后，听到转辙机里发出“咔”的一声

C、看到尖轨密贴即可

D、凭摇道岔的手感

高处作业施工中施工人员手持电动工具操作，工具应（）以防意外坠落。

A、设置防坠绳

B、双手握紧

C、戴防滑手套