题目内容

____you stepped into the lab with your shoes on? You are supposed to take them off before you enter it.

A.
How come
B.
How about
C.
How dare
D.
How long

A
解析：
词义辨析A. How come 为什么 B. How about （用于建议）…怎么样？ C. How dare 怎么胆敢 D. How long 多长 “你为什么穿鞋进实验室？你应该在进入前脱掉鞋子”选Ａ

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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 kilowatts per square centimeter (mw. / sq. cm. ) ; a satisfactory feeling of warmth occurs between 35 and 50 mw. / 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.

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.

According to Paragraph 2, which of the following does not describe the characteristics of a microwave heater?

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．

The test conducted by Buffler shows that when a person feels comfortable warmth, he receives about ________________.

A. 20 mw. / sq. cm. B. 40 mw. / sq. cm.

C. 60 mw. / sq. cm. D. 85 mw. / sq. cm.

According to Paragraph 4, which of the following fills the room with low-power microwaves?

A. The magnetron.

B. The motion detector.

C. The microwave oven.

D. The radiation-absorbing chemical.

Which of the following statements about microwave heaters would Buffler most probably agree with?

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.

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.

【小题2】According to Paragraph 2, which of the following does not describe the characteristics of a microwave heater?

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.

【小题3】The test conducted by Buffler shows that when a person feels comfortable warmth, he receives about ________________.

【小题4】According to Paragraph 4, which of the following fills the room with low-power microwaves?

A．The magnetron.	B．The motion detector.
C．The microwave oven.	D．The radiation-absorbing chemical.

【小题5】Which of the following statements about microwave heaters would Buffler most probably agree with?

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.

下面几个人分别就父亲对自己的影响表达了看法。阅读下面所给的五个选项（A、B、C、D、E），选出符合各自看法的最佳选项。选项中有一项是多余选项。

1.Kitty: Dad encouraged me to keep great determination to do anything.

2.Kelly: Dad gave me a new life which is full of love and happiness.

3.Aidan: Dad is the person who introduced me to my sports career (生涯).

4.Bruce: Dad taught me to share housework and take family responsibility.

A．Dear Daddy, you stepped into my life years ago, and became my dad, a man who raised three fatherless kids and adopted (收养) another. You did everything for us, and you managed to have taken care of Mom, who has been sick, and the grandkids as well. Lessons learned are love, and kindness. We love you dearly.

B．My dad taught me how to play basketball. Now I am a professional player at basketball. Although I sometimes didn’t play well, my dad always encouraged me not to lose heart. Now I have a dream of being able to play basketball on the Celtics. I love my dad!

C．The most important thing that my dad ever taught me was “Never do anything halfway”. He always told me to do my best to show my ability and character. “It shows what kind of person you are,” my dad would say. “People will remember and respect you for that.”

D．My dad has taught me love, hope, respect and the value of hard work. He has taught me never to be afraid; he has taught me the value of a job well done; he has taught me how to ride a bike, then to drive a car. He always tells me that he believes in me and that I can manage to deal with the things around me.

E. My dad and I have a funny company called “Priority”. He has taught me how to take care of the pool (Priority Pool), how to plan family birthday parties (Priority Parties), and how to clean the computer (Priority Computers). The list goes on. I’m proud of my dad and grateful for my time with him. We have a lot of fun doing daily housework together.

You stepped into the lab with your shoes on? You’re _______ to take them off before you enter it.

A．invited

B．supposed

C．forbidden

D．permitted

____you stepped into the lab with your shoes on? You are supposed to take them off before you enter it.

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