阅读理解。
The following is the instruction to the people who have to take this medicine.
Dosage: Adult twelve years old and over take two teaspoonfuls as needed, not more than fifteen
teaspoonfuls per day. Children six years old to twelve years old take half the adult dosage, not more
than seven teaspoonfuls per day.
Warning: Do not overtake this medicine unless directed by a doctor. Children under six years old
and persons with high blood pressure, heart disease do not take this medicine. This preparation may
cause drowsiness. So do not drive or operate machinery while taking this medicine. Long- time cough
is dangerous. If relief does not occur within three days, discontinue use and go to see your doctor.
1. According to the direction, which of the following people should take the medicine mentioned?
A. Someone with high blood pressure
B. Someone with heart disease
C. Someone under six
D. Someone who has a cough
2. The underlined word "drowsiness" probably means
A. feeling sleepy
B. high blood pressure
C. coughing
D. headache
3. A ten-year-old child should .
A. not take this preparation
B. not take two teaspoonfuls of this preparation
C. take one teaspoonful of this preparation
D. take one - half teaspoonful
4. If this medicine does not help, one should .
A. take fifteen teaspoonfuls on the fourth day
B. stop driving and operating machinery
C. stop taking it and see a physician
D. take half of the usual dosage
5. According to the instruction of this medicine, for purposes of dosage, an adult is a person of .
A. six years old
B. seven years old
C. twelve years old
D. none of the above
（2）
，所以输电电压
∵P输=U2I，
，输电线上损失的功率
；
，
，
；