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【简答题】
土地退化的概念,还可以从广义和狭义上理解。广义的土地退化指 ____,主要表现为: _____,直接损坏生态系统的生产力:通过水分与能量平衡交替,对全球气候及C、N、S、P等元素循环产生不利影响;导致政策与社会的不稳定性,并加速森林破坏,土壤侵蚀,水体污染,温室气体向大气扩散等。狭义的土地退化指____,主要指____而导致的土地质量下降过程,表现为以土壤有机质下降为标志的耕地退化和草地退化。
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举一反三
【简答题】把汉字和含有该字拼音的词连起来。 Join the character and the corresponding pinyin of the word that contains the character.
【简答题】把汉字和含有该字拼音的词连起来。 Join the character and the corresponding pinyin of the word that contains the character.
【单选题】Our experiment had got into _____trouble, so we decided to take _____ chance and add more water, and luckily, we succeeded.
A.
/ ; /
B.
/ ; a
C.
the; a
D.
a; a
【简答题】把汉字和含有该字拼音的词连起来。Join the character and the corresponding pinyin of the word that contain the character.
【简答题】创建一个放射性渐变需要使用什么方法?
【单选题】Which one of the following is NOT true about the experiment mentioned in Paragraph 4 ?
A.
It can be used to confirm previous suspects about neutrinos.
B.
The number of muon neutrinos changed in the process of the experiment.
C.
A more accurate number can be put on the mass of neutrinos based on this experiment.
D.
The result of the experiment contradicts that in 1998.
【单选题】喝汤时不宜发出声响;若汤热,( )。
A.
可轻轻用嘴吹，把汤吹凉了再喝.
B.
可试温但不宜用嘴吹，更不宜用匙拨弄.
C.
不宜用嘴吹，但可用汤匙搅拌.
D.
用扇子降温.
【单选题】I shouted to the driver of the tractor to ______ and let me through.
A.
pull out
B.
pull up
C.
pull through
D.
pull over
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