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单项选择题

The bags used to hold water are likely to be damaged by ______.

A．mosquito insects
B．a fitted cover
C．a first-flush device
D．sunlight

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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.

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.