单项选择题

Which of the following contributes to the low-cost of using rainwater

A．Rainwater is free of chemical treatments.
B．People have been harvesting rainwater for centuries.
C．The water harvesting system is built on a platform.
D．Rainwater can be collected using pipes.

<上一题目录下一题>

热门试题

单项选择题

What should be done to prevent insects from eating into the water harvesting system at the bottom

A．The two bags holding the water should be put inside the metal tank.
B．The inner bags need to be replaced every two years.
C．The water harvesting system should be built on a platform.
D．A cover should be used to prevent insects from eating it.

单项选择题

Which of the following is true according to the last paragraph

A．Mr. Rubin is the founder of Hillel.
B．Mr. Rubin thinks that Judaism is not a religion and it's an experience.
C．Hillel is an organization concerned with Jewish college students in the world.
D．Hillel has asked certain people to carry out a study about Jewish attitudes towards Judaism.

相关试题