[单项选择]After the use of the laser beam, surgeons can perform operations which ______.


A. leave the patients with negative effects
B. can. treat only human eye disease
C. do little damage to the patients themselves
D. make the patients need a long time to recover

[单项选择]After the use of the laser beam, surgeons can perform operations which ______.


A. leave the patients with negative effects
B. can. treat only human eye disease
C. do little damage to the patients themselves
D. make the patients need a long time to recover

[单项选择]A Laser beam can be turned into a ______ weapon.
A. deadly
B. dead
C. deadthly
D. deadening

[单项选择]A laser beam can be turned into a ______ weapon.
A. dead
B. deathly
C. dying
D. deadly

[单项选择]The reason why the laser beam is very strong is that ______.


A. it is artificially illuminated (照亮)
B. it is made up of a concentrated beam of light
C. it sends out heat in all directions
D. its heat is increased by the heat of the sun

[单项选择]A laser beam is used to ______even the hardest substance.
A. light up
B. repair
C. identify
D. penetrate

[单项选择]The beam that is ______by a laser differs in several ways from the light that comes out of a flashlight.


A. emitted
B. transported
C. motivated
D. translated

[单项选择]Laser beams can be used to bore metals and other hard materials.


A. trim
B. melt
C. drill
D. slice

[单项选择]A laser can be best described by______.


A. a device for stimulating atoms and molecules to emit light
B. an atom in a high energy state
C. a technique for destroying atom or molecules
D. an instrument for measuring light waves

[单项选择]Laser beams can be used to {{U}}bore{{/U}} metals and other hard materials.
A. trim
B. melt
C. drill
D. slice

[单项选择]

Passage Three
You can use your Business Telecard International at any card phone in the UK. Here is some information about making international phone calls.
You can now phone almost any country in the world, although In some cases you can only call major cities. When you cannot make direct dialing calls, you can ask the international operator to help you. This is more expensive and takes more time, but it may be helpful if you want to speak to a particular person and no one else; in this case you should ask for a "person-to-person" call. Even more expensive is a re verse charge (对方付款) call when the person who receives the call pays.
If the international line is busy, you can reserve a call; explain the number you want and the operator will call you back when the line is free.
You can save money by calling outside office hours, e.g. early in the morning, late at night, and on Sundays.
Remember that the time may be different
A. 10a.m.
B. 5p.m.
C. 11 p.m.
D. 11a.m.