汽车从静止开始沿平直公路做匀加速运动，所受阻力始终不变，在此过程中，下列说法正确

辛弃疾《西江月•夜行黄沙道中》中有这样一句“稻花香里说丰年，听取蛙声一片”．

（1）青蛙的生殖过程中幼体和成体在形态和结构方面有显著差异，称为______发育（选填“变态”或“直接”）．

（2）蛙鸣叫的意义是______（选填“求偶”或“觅食”），蛙的受精方式是______受精，（选填“体内”或“体外”）．蛙的幼体---蝌蚪和鱼相似，用______呼吸，（选填“鳃”或“肺”）．

脓液稀薄、量多、粉红色（）

A．金黄色葡萄球菌 

B．溶血性链球菌 

C．铜绿假单胞菌 

D．大肠杆菌 

E．类杆菌

设置安保联锁系统可以（）。

A.避免事故发生造成的经济损失

B.降低事故发生造成的经济损失

C.保证安全但会导致事故发生经济损失的增加

D.保证安全但不会降低事故发生造成的经济损失

The development of e-commerce may well bring the world into a brand new era of "electronic currency". At the moment, (52) areas in Europe, the United States and Asia have already started studying the possibility of an electronic currency. Electronic currency is not only about currency. It (53) to an entire finance system on the Net. It includes a virtual numeric currency, an electronic system of withdrawals, transfers and loans, and (54) cards of all shapes and sizes. The (55) of an electronic currency system implies the emergence of "virtual banks" and "virtual enterprises". Actually, the first virtual bank appeared in the US in 1995. (56) it is a small and insignificant bank, it represents the trend of the future. In time to come, we may even have to (57) the familiar paper currency.

As the Net pushes the economy (58) rapidly, the economy is also bringing the Net market forward, resulting in the Internet itself becoming the world’s largest emerging market. Of course, this is just the beginning. Although there are many companies which made huge profits (59) in the Internet market, they tend to be small companies. To date, most companies are making losses. The competition in the knowledge-based economy will also be more (60) This will definitely promote (61) and more efficient cooperation.

53().

A.bridges 

B.camps 

C.refers 

D.casts

无线网络优化项目工作的启动阶段的工作内容不包括（）

A.用户需求搜集

B.确认分工界面

C.项目计划

D.了解优化目标区域概况，包括地理以及参数配置等