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【单选题】
下列生态系统中，人的作用消失后，会很快退化的是 [ ]A.
森林生态系统
B.
草原生态系统
C.
农田生态系统
D.
海洋生态系统
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皮皮学刷刷变学霸
举一反三
【单选题】______ could be the best summary of the last two paragraphs.
A.
Digital still camera and traditional camera
B.
Pros and cons of digital still camera
C.
Capturing the world digitally
D.
The ways to use digital still camera
【单选题】--- I bought the digital camera two months ago. --- You mean that you __________ it for two months.
A.
have had
B.
have been
C.
have bought
D.
have taken
【简答题】Every camera we sell comes with a two-year ________. A) guarantee B) safety C) confirmation D) conservation
【单选题】Every camera we sell in our shop comes with a two-year _______ .
A.
guarantee
B.
safety
C.
evaluation
D.
instruction
【单选题】下列有关肾盂肾炎的叙述,不正确的是
A.
男性发病率较高
B.
多由细菌感染引起
C.
大肠杆菌感染最为常见
D.
表现为化脓性间质性肾炎
E.
可分为上行性感染和血源性感染
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