脊髓损伤中央综合征

正确观察、描述实验现象是同学们必备的实验技能，如图所示的两个实验现象都有错误，请加以改正。

实验（1）将燃着蜡烛迅速伸入瓶中时，燃着的蜡烛会          ，实验（2）错误之处应改为                      。

如图所示，用激光灯照射水槽的中央，在槽底形成一光斑．保持手电筒位置不变，向槽中慢慢注入清水，则光斑会向______（选填“左”或“右”）移动，原因是______．

“当斯大林逝世之际--俄罗斯当时是世界上数一数二的强国！那些指责斯大林的人却用其双手毁灭了这个超级大国！”直接“毁灭”这个超级大国的苏联领导人是（）

A.赫鲁晓夫

B.勃列日涅夫

C.戈尔巴乔夫

D.叶利钦

The plant called the scarlet gilia can have either red or white flowers. It had long been thought that hummingbirds, which forage by day, pollinate its red flowers and that hawkmoths, which forage at night, pollinate its white flowers. To try to show that this pattern of pollination by colors exists, scientists recently covered some scarlet gilia flowers only at night and others only by day: plants with red flowers covered at night became pollinated; plants with white flowers covered by day became pollinated.
Which of the following, if tree, would be additional evidence to suggest that hummingbirds are attracted to the red flowers and hawkmoths to the white flowers of the scarlet gilia

A．Uncovered scarlet gilia flowers, whether red or white, became pollinated at approximately equal rates.

B．Some red flowers of the scarlet gilia that remained uncovered at all times never became pollinated.

C．White flowers of the scarlet gilia that were covered at night became pollinated with greater frequency than white flowers of the scarlet gilia that were left uncovered.

D．Scarlet gilia plants with red flowers covered by day and scarlet gilia plants with white flowers covered at night remained unpollinated.

E．(E) In late August, when most of the hummingbirds had migrated but hawkmoths were still plentiful, red scarlet gilia plants produced fruit more frequently than they had earlier in the season.

手工收边时，制作波纹的长度是收边宽度的多少（）？

A、1/2

B、1/3

C、2/3

D、3/4