鉴于物业服务企业通常要对多个地点的多个物业同时实施管理，因此从管理的层次上，又可以分为（）等层次。

Some kinds of winds might cause illness or health problems, because().

A、winds from mountain regions blowing faster and faster warm and dry the air

B、researchers say there are more strokes and heart attacks during windy weather of this kind

C、bad headaches and asthma attacks are some possible examples of the effects of the winds

Because of the economic slump, there are only ______ on the beach as before.

A．one-fifth tourists as many

B．one-fifth as many tourists

C．tourists one-fifth as many

D．tourists as one-fifth many

Because of the economic slump, there are only ______ on the beach as before.

A．one-fifth tourists as many

B．one-fifth as many tourists

C．tourists one-fifth as many

D．tourists as one-fifth many

Health depends ________ good food, fresh air and enough sleep.

A.from

B.up

C.over

D.on

Susan got sunburned because she ______ on the beach all afternoon.

A．lay

B．is lying

C．has lain

D．had been lying

Health depends ______good food, fresh air and enough sleep.

A．from

B．up

C．on

D．over

Girls' work is______ .

A．harmful to the health because it is heavy

B．not harmful to the health because it is light

C．not harmful to the health though it is heavy

D．harmful to the health though it is light

Cansumers are not supposed to throw used computers in the trash because ______

A．they contain large amounts of harmful substances

B．this is banned by the California government

C．some parts may be recycled for use elsewhere

D．unscrupulous dealers will retrieve them for profit

The awardwinning beach house is quite strong because ______.

A．it is strengthened by steel rods

B．it is made of redwood

C．it is in the shape of a shell

D．it is built with timber and concrete

Ensure that the word you replace it with is grammatically correct in the sentence. "It would be a mischaracterization to say that the coronavirus was beneficial to health because of these air pollution reductions," says Jill Baumgartner, associate professor and epidemiologist at McGill University.