_______________ region is the most western region in the Pacific. A: Nino4 B: Nino3 C: Nino2 D: Nino1

El Nino指赤道中东太平洋海温异常升高的现象。

What does the author warns to tell us about El Nino by the last two paragraphs?

"E1 Nino" and "La Nina" are words in A: English. B: Spanish. C: French. D: German.

（）has warmed the waters off AlaskA． A: El Nino B: The sun C: Over-population D: Pressure

______ has warmed the waters off Alaska. A: El Nino B: The sun C: Over-population D: Pressure

A strong El Nino is often associated with wet winters over the southern U.S., as well as drought in Indonesia, Philippines and Australia.

We can learn from the passage that _______. A: El Nino is the most destructive natural disaster. B: NASA scientists are optimistic about the weather in 2005. C: The energy imbalance of the earth will result in the warm temperature in 2005. D: Oceans help store heat more efficiently than other things.

【单选题】NO 2 、NO 2 - 、NO 2 + 键角大小关系正确的是 。 A. NO 2 > NO 2 - >NO 2 + B. NO 2 + >NO 2 >NO 2 - C. NO 2 - > NO 2 >NO 2 + D. NO 2 + > NO 2 - >NO 2

求定积分[img=179x43]17da65388c0b1ca.png[/img]； （ ） A: log(2^(1/2) + 1)/2 + 2^(1/2)/2 B: log(2^(1/2) + 1)/2 - 2^(1/2)/2 - 1/2 C: log(2^(1/2) + 1)/2 + 2^(1/2)/2 - 1/2 D: log(2^(1/2) + 1)/2 + 2^(1/2)/2 + 1/2