题目内容

An introductory sentence to a brief summary of the passage is given below. Complete the summary by adding the THREE answer choices that express the most important ideas in the passage. Some answer choices do not belong in the summary because they express ideas that are not given in the passage or are minor ideas in the passage. This question is worth 2 points. Natural selection is the name given by Darwin to the process whereby new species evolve over time as individuals with useful traits survive and reproduce, passing those traits on to new generations. ____________ ____________ ____________ Answer Choices 1. Darwin believed that natural selection favored organisms that had traits that could help them find food and survive predator attacks and environmental pressures. 2. Darwin explained advanced traits that did not seem to affect an organisms survival as being characteristics useful in finding a mate. 3. Moths near industrial centers evolve dark coloration when the trees in which they live are blackened by pollution from nearby factories. 4. Recently, scientists have expanded the idea of natural selection to include traits that benefit the species as a group, even when those traits seem harmful to the particular individuals who possess them. 5. The peacocks colorful tail feathers are meant to attract peahens, which view the bright colors involved in the display as a sign of the males good health. 6. Religious groups opposition to evolutionism has led some schools to reconsider teaching it, even though it is an established scientific theory with much evidence to prove it.
Wegener based the theory of Continental Drift on all of the following observations EXCEPT

A. opposition of climates.
B. fit of continents.
C. similarities of living animals.
D. similarities in rocks and ic

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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:

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.

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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