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Suddenly one of the leaves begins to fly in a strong wind; the leaf is really no leaf at all--it’s an insect ______ as a leaf.
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下列叙述正确的是（）。
下列细胞内的反应发生在生物膜上的是（）
Time for another global-competitiveness alert. In the Third International Mathematics and Science Study--which last year tested a half-million students in 41 countries- American eighth graders 21 below the world average in math. And that’s not even 22 part. Consider this as you try to 23 which countries will dominate the technology markets of the 21st century: the top 10 percent of America’s math students scored about the same as the average kid in the global 24 , Singapore. It isn’t exactly a news flash these days 25 Americans score behind the curve on international tests. But educators say this study is 26 because it monitored variables both inside and outside the classroom. Laziness- the factor often 27 for Americans’ poor performance--is not the culprit here. American students 28 spend more time in class than pupils in Japan and Germany. 29 , they get more homework and watch the same amount of TV. The problem, educators say, is not the kids but a curriculum that is too 30 . The study found that lessons for U.S. eighth graders contained topics mastered by seventh graders in other countries. Teachers actually agree that Americans need to 31 their kids to more sophisticated math earlier. Unfortunately, experts say, the teachers don’t recognize that 32 these concepts are taught is as important as the concepts themselves. Most educators rely 33 on textbooks and rote learning (死记硬背) . While many textbooks cover 34 ideas, most do so superficially, 35 students with the techniques but not the mastery of the broader principles. 29（）
plain prose
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