A growing wildfire in Napa County continued to threaten hundreds of buildings Wednesday night as several other fires broke out in dried plants in Central and Northern California.

The Butts fire had changed into charcoal 3,800 acres of brush, pine and oak trees in a valley and had spread from Napa County into Lake County, state forestry officials said. The region’s well-known vineyards were not threatened by the flames. 

About 800 firefighters were battling the blaze, even as more crews from Los Angeles County and other areas of the state were ordered to react to the fire, which was 30% under control. In the air, six helicopters and four fixed-wing tankers made repeated attacks on the wildfire as crews on the ground struggled to cut controlling lines with bulldozers and firefighters using hand tools, the California Department of Forestry and Fire Protection said. As of Wednesday night, flames were threatening about 380 buildings. About 200 homes had been moved to safer places, officials said.

The fire broke out Tuesday afternoon off Butts Canyon Road in Pope Valley, northwest of Lake Berryessa. In the Sequoia National Forest, the Ranch fire had burned about 150 acres Wednesday night in a valley about 200 miles northeast of Bakersfield, the U.S. Forest Service said. High temperatures and low relative humidity were complicating the battle to control the fire. About 200 firefighters, helped by helicopters and fixed-wing aircraft, were attacking the fire earlier in the day. 

In Northeastern California, lighting strikes caused several smaller fires in heavily forested areas, fire officials said. Forest Service smoke jumpers and hotshot crews were being called in to fight the fires. Wildfires broke out as high pressure was causing hot weather across California, according to the National Weather Service.

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1.What is the present situation of the Butts wildfire?

A The fires have burnt many trees into ashes.

B The fires have been under control.

C The wildfire is spreading to larger areas.

D The fires destroyed the region’s famous vineyards.

解析：选C。细节理解题。根据文章首句A growing wildfire in Napa County continued to threaten hundreds of buildings…可知，加州山火目前呈蔓延的趋势，不容乐观。

2.Who struggled to put down the wildfire according to the passage?

A Firefighters on the ground and crews of helicopters in the air.

B 800 firefighters from Los Angeles County battling the big fire.

C Crews of six helicopters who made several attacks to control the fire.

D People on the ground controlling the fire with bulldozers and hand tools.

解析：选A。细节理解题。根据文章第三段可知，地面消防队员和消防直升机协同作战，努力控制山火，故选A。

3.What is implied in the passage?

A There are so many firefighters that the fire will be controlled soon.

B Temperatures and humidity add difficulty to the control of the fire.

C The American firefighters are well equipped.

D There are many people living near the forests.

解析：选B。推理判断题。根据文章第四段High temperatures and low relative humidity were complicating the battle to control the fire.可以判断，高温天气和过低的湿度增加了扑灭山火的难度。

4.What caused the fires in Northeastern California?

A Thick forests.

B Cigarette ends.

C Dried plants.

D Lighting strikes.

解析：选D。细节理解题。根据文章最后一段lighting strikes caused several smaller fires…可知，加州东北部地区的山火是由雷电造成的。

5.What is mainly talked about in the passage?

A California suffers from wildfires.

B Californian wildfires were under control.

C Firefighters and helicopters worked to control wildfires.

D Hot weather causes wildfires across California.

解析：选C。主旨大意题。通读全文可知，文章的主要内容是消防队员与消防直升机协作，控制加州山火。故选C。