4. Below the canopy level of a tropical rainforest grows an overabundance of plants。

　　5. New tree seedlings will not survive to reach the canopy level unless ______。

　　6. Epiphytes, which form much of the understory of the rainforest, get all their water and nutrients from ______。

　　7. Stranglers are so called because they ______ by blocking the sunlight and competing for the nutrients。

　　8. Since rainforest bacteria and trees depend on each other for life, the relationship they form is termed ______。

　　9. Plant species are dispersed over a large area with the help of ______。

　　10. As we are still ignorant of millions of unique life forms in the rainforest, deforestation can be compared to the destruction of ______。

　　keys：

　　Part I

　　Say No to Pirated Products

　　Nowadays, the problem of piracy has become more and more serious. Books, tapes, VCDs and others high-tech products have been pirated. For instance, When a new product comes onto market, most probably, its pirated counterpart will soon put on its appearance in the market, too。

　　Piracy has caused a great loss to legitimate producers, inventors and writers in many ways. To start with, the pirated products often cost much less than the genuine ones so that they enjoy a better trading position in spite of their relatively poor quality. The genuine products, on the contrary, sell poorly. What's worse, pirated books sometimes do great harm to the authors' reputation due to some misprints. In the long run, pirated products may have a negative impact on customers. Those legitimate producers' creativity and enthusiasm may be deeply hurt by the fact that some customers are more interested in the pirated products for the sake of small gains。

　　In my opinion, it's high time that everyone started the battle against piracy. First, customers should develop their consciousness to resist the pirated products. Second, the government should take effective measures to put an end to piracy. Finally, laws must be strictly enforced to completely, ban piracy. Only in this way can we wipe the pirated products out of our life。

　　Part Ⅱ Reading Comprehension (Skimming and Scanning)

　　1. N 2. Y 3. NG 4. N

　　5. some older trees die

　　6. the canopy layer

　　7. kill the host tree

　　8. symbiotic

　　9. insects and birds/insects/birds/animals

　　10. an unknown planet