[填空题]Dilemma-sharing can’t give people a chance to make suggestions and be part of the process.

[填空题]Dilemma-sharing can’t give people a chance to make suggestions and be part of the process.

[简答题]Group dates give young people a chance to get to know many other young people and_____________(度过一个更加轻松愉快的夜晚) .

[单项选择]Why can’t the woman give the man directions
A. She is very much afraid.
B. She has never heard of the place.
C. She is not familiar with the place.
D. She has never taken the bus before.

[填空题]Those who can give a(reason)______excuse can ask the permission to leave.

[单项选择]
Scientists can’t yet make an invisibility cloak like the one that Harry Potter uses. But, for the first time, they’ve constructed a simple cloaking device that makes itself and something placed inside it invisible to microwaves.
When a person "sees" an object, his or her eye senses many different waves of visible light as they bounce off the object. The eye and brain then work together to organize the sesensations and reconstruct the object’s original shape. So, to make an object invisible, scientists have to keep waves from bouncing off it. And they have to make sure the object casts no shadow. Otherwise, the absence of reflected light on one side would give the object away.
Invisibility isn’t possible yet with waves of light that the human eye can see. But it is now possible with microwaves. Like visible light, microwaves are a form of radiant energy. They are part of the electromagnetic spectrum, which also
A. It is made of a special material with unusual ability.
B. Microwaves bounce off it when they strike it.
C. Microwaves pass through it when they strike it.
D. It bends the microwaves all the way around until they reach the opposite sid