A personal alarm is designed for old people to ______.
A、detect safety conditions at home
B、avoid falls in the bathroom
C、send out signals for help
D、make phone calls easily
The teacher wrote his _____ in the margin of the composition.
A、critic
B、commands
C、comments
D、commission
If you read this book, you will have a better _____ of the causes of trouble.
A、understanding
B、learning
C、knowledge
D、explanation
According to the passage, pocket calculators ______.
A、will help students think fast
B、will make math too easy for them
C、will do harm to students’ thinking ability
D、will contribute to the spread of new technology
马克思说:“一切商品对它们的所有者是非使用价值,对它们的非所有者是使用价值。”对这句话应理解为( )。
A、商品不可能既有使用价值又有价值
B、商品所有者同时获得使用价值和价值
C、使用价值是商品的本质属性
D、商品的使用价值和价值是相互排斥的
General Blair had been in the army _____ for 35 years when he retired from the navy.
A、service
B、work
C、job
D、homework