tpo34阅读及答案(2)

　　13. Look at the four squares [■] that indicate where the following sentence could beadded to the passage. Where would the sentence best fit? Sometimes they capture theinsects to feed their protein-hungry larvae.

　　Ants are portably the most frequent and certainly the most persistent defenders of plants. ■【A】 Since the highly active worker ants require a great deal of energy, plants exploit thisneed by providing extrafloral nectar that supplies ants with abundant energy. ■【B】 To returnthis favor, ants guard the nectaries, driving away or killing intruding insects that mightcompete with ants for nectar. ■【C】 Many of these intruders are herbivorous and would eatthe leaves of the plants. ■【D】

　　14. Directions: An introductory sentence for a brief summary of the passage of thepassage is provided below. Complete the summary by selecting the THREE answerchoices that express the most important ideas in the passage. Some answer choices donot belong in the summary because they express ideas that are not presented in thepassage or are minor ideas in the passage. This questions is worth 2 points.

　　Many plants have extrafloral nectaries that produce nectar even during periods inwhich the plant is not flowering.

　　A.Evolutionary history shows that plants that produce extrafloral nectar originated in thetropics.

　　B.Extrafloral nectar has a higher concentration of sugar than floral nectar and is moreattractive to ants and other insects.

　　C.The protectionist hypothesis is that extrafloral nextar attracts ants, and that the ants, inorder to preserve this energy-rich food source, attack insects that might harm the plant.

　　D.Evidence accumulated during the twentieth century proved that ants provide significantbenefits for plants with extrafloral nectaries.

　　E.Research has shown that American morning glory plants that are protected by ants producesignificantly more seeds than morning glory plants that are not protected by ants.

　　F.Ants generally ignore small insects, but they will eat the adults of large insect species as wellas their eggs and larvae.

　　tpo34阅读答案

　　1.B

　　2.B

　　3.A

　　4.D

　　5.A

　　6.A

　　7.C

　　8.B

　　9.B

　　10.C

　　11.C

　　12.A

　　13.C

　　14.CDE