风湿性心脏病二尖瓣狭窄，CDFI显示在瓣口处形成射流，射流呈偏心型并分成几股，此种表

（）测试用例设计方法既可以用于黑盒测试，也可以用于白盒测试。

A．边界值法

B．基本路径法

C．正交试验设计法

D．逻辑覆盖法

农村土地整治包括（）

A、农村土地整理复垦开发

B、农村村庄整治

C、农村土地收储整理开发

D、农民集中住房

朝鲜族与白族人民都喜欢白色，穿衣喜白色。

On December 25, 2000, many people across North America received a rare Christmas treat when the moon passed in front of the sun resulting in a partial solar eclipse.
Solar eclipses occur when the moon (47) between the earth and the sun, and the moon’s shadow covers part of the earth; and a total solar eclipse takes place when the moon’s shadow blocks out the sun (48) . What made this particular solar eclipse unique was that this event has occurred on December twenty-filth only 30 times (49) the past 5000 years, the last time in 1954.
But people must be exceptionally (50) when attempting to view a solar eclipse. Without taking precautionary (51) , one can permanently damage the retina of the eye; however, there are several safe methods of (52) this heavenly marvel.
First, you can view a solar eclipse by using eclipse safety glasses for filtering out the sun’s (53) rays. They should be used when any part of the sun is visible.
Sunglasses can block out some of the sun’s ultraviolet rays, but the results can be very deceptive. The eye’s natural (54) to this darkened state when wearing sunglasses is to make the pupil larger, which allows in more light and can (55) the damage to your eye.
You can watch an eclipse by projecting the sun’s (56) on a piece of paper either by using a telescope, or easier yet, by creating a pinhole in a piece of paper and viewing the result on another piece of paper, thus called a pinhole projector.
[A] lively [I] during
[B] passes [J] intensify
[C] among [K] measures
[D] careful [L] reaction
[E] target [M] investigating
[F] entirely[N] harmful
[G] image [O] poses
[H] witnessing

发动机混合气浓度大以及混合气不均匀都会使排气中的（）增加。