题目内容
It might rain tomorrow, _________ we will have to put off the sports meet until next Friday.
- A.in case
- B.if possible
- C.in which case
- D.in that case
in case要是……话,后面接假设的条件。in that case在那种情况下,此句中间是逗号,说明存在从句关系,in which case中which指“明天可能下雨”,注意:In case it might rain tomorrow, we will have to put off the sports meet until next Friday.=It might rain tomorrow, in which case we will have to put off the sports meet until next Friday.
Microwaves may be great at warming up food, but what about warming people?
Using microwaves to directly heat owners of a room would save much of the energy wasted by heating walls and furniture. And despite popular ideas about microwaves, this technique would be safe, according to Charles R. Burlier of the Microwave Research Center in Marlborough, New Hampshire. Low-power microwaves only penetrate (贯穿) the skin (low-power microwave penetration in a ham is about 0.2 inches, for example) and with no negative effects.
To test this idea, Buffler subjected himself to microwaves in a special room using a standard 500-watt, 2459 MHz magnetron (磁控管). He found that a person will start to feel warmth at about 20 milliwatts per square centimeter (mw. / sq. cm. ) ; a satisfactory feeling of warmth occurs between 35 and 50mw. / sq. cm. By comparison, a person standing in noonday summer sun feels the amount of 85 mw. / sq. cm. And a frozen meat pie in your microwave oven receives about 1000 mw. / sq. cm.
In houses of the future, each room could be provided with its own magnetron, says Buffler. When you stepped into the living room, for example, a motion detector (运动感应器)would turn on the magnetron, filling the room with low-power microwaves. In the same way that a microwave oven heats up a hamburger, but not the plate it’s on, you would feel warmth from the microwaves without changing the temperature of your coffee table. (You could, however, make your favorite easy chair even more comfortable by treating it with a radiation-absorbing chemical.)
While it might be some time before homeowners are comfortable enough with the idea to set up whole-body microwave heaters in houses, Buffler says microwaves may attract livestock(家畜) farmers. Lambs that are born outdoors in winter, for example, are frequently lost to cold. Microwaves could warm the lambs safely and quickly.
【小题1】Which of the following can tell the main idea of the passage?
A.A new heating system. | B.A new microwave oven. |
C.A popular technique. | D.The magnetron. |
A.It directly heats people in a room. |
B.It heats walls and furniture in a room. |
C.It is safe. |
D.It saves energy. |
A.20 mw. / sq. cm. | B.40 mw. / sq. cm. | C.60 mw. / sq. cm. | D.85 mw. / sq. cm. |
A.The magnetron. | B.The motion detector. |
C.The microwave oven. | D.The radiation-absorbing chemical. |
A.Microwave heaters will soon be widely used by homeowners. |
B.Microwave heaters sometimes make people feel uncomfortable. |
C.Perhaps microwave heaters will be first used by livestock farmers, who wish to protect their lambs in winter. |
D.Microwave heaters cannot be accepted by the public because they are somewhat unsafe. |