题目内容

According to paragraph 3, why has designating large segments of the Great Barrier Reef as

A. Fishermen and shippers ignore the designation.
B. Activity in unprotected areas can influence the whole Reef.
C. Oil extracted from the Reef sometimes spills into the ocean.
D. The species living there are already endangere

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理想变压器的电路模型如题图所示，若其作为二端口网络，则其A参数为：a₁₁=，a₁₂=，a₂₁=，a₂₂=。

All of the following are mentioned in paragraph 4 as reasons why the steamboat replaced the clipper EXCEPT:

A. Steamboats were more reliable than clippers.
B. Steamboats were faster than clippers.
C. Steamboats were more durable than clippers.
D. Steamboats were better able to navigate the Suez Canal.

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According to paragraph 2, all of the following are mentioned as living in the Great Barrier Reef EXCEPT

A. sharks.
B. sponges.
C. anemones.
D. whales.

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Look at the four squaresin the passage that indicate where the following sentence can be added to the passage. The judge or judges must then decide, based purely on the written responses, which subjects are human and which are artificial. Where would this sentence best fit？

A. (Ａ)
B. (Ｂ)
C. (Ｃ)
D. (Ｄ)

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According to paragraph 3, why has designating large segments of the Great Barrier Reef as

A. Fishermen and shippers ignore the designation. B. Activity in unprotected areas can influence the whole Reef. C. Oil extracted from the Reef sometimes spills into the ocean. D. The species living there are already endangere

理想变压器的电路模型如题图所示，若其作为二端口网络，则其A参数为：a11=______，a12=______，a21=______，a22=______。

All of the following are mentioned in paragraph 4 as reasons why the steamboat replaced the clipper EXCEPT:

According to paragraph 2, all of the following are mentioned as living in the Great Barrier Reef EXCEPT

Look at the four squaresin the passage that indicate where the following sentence can be added to the passage. The judge or judges must then decide, based purely on the written responses, which subjects are human and which are artificial. Where would this sentence best fit？

A. Fishermen and shippers ignore the designation.
B. Activity in unprotected areas can influence the whole Reef.
C. Oil extracted from the Reef sometimes spills into the ocean.
D. The species living there are already endangere

理想变压器的电路模型如题图所示，若其作为二端口网络，则其A参数为：a₁₁=，a₁₂=，a₂₁=，a₂₂=。