1 . 课文语法填空

    1     has been believed for a long time that talking plants are fantasy. But new research has revealed that they really can communicate with each other.

Some plants are believed to communicate with each other through chemicals. When     2     (attack) by insects, they release tiny amounts of chemicals. This is     3     a warning or a call for help. When other plants detect     4     warnings, they release their own chemicals to drive insects away. Some of the chemicals also attract wasps to kill these insects.

More     5     (surprising), plants also use sound     6     (communicate) with each other though people can’t hear the sound. Some plants make noises with their roots. Some plants “listen” to tell if their neighbouring plants are     7     (help) or unfriendly. Some plants make clicking noises,     8     (indicate) that drought is coming. Most surprisingly of all, plants can form the “wood wide web” to share information or even food with each other.

    9     (scientist) will learn more about the way in     10     plants communicate with each other.

2 . Directions: After reading the passages below, fill in the blanks to make the passages coherent and grammatically correct.For the blanks with a given word, fill in each blank with the proper form of the given word; for the other words, use one word the best fits each blank.

Cactuses are a kind of juicy plants     1     leaves are reduced to spines(针刺).There are no different branches, leaves and stem area.Instead, the whole body     2     (cover) with spines which are reduced leaves.

Whole fleshy area of the plant is doing the work of photosynthesis(光合作用), in which green plants take in water and carbon dioxide(CO2) and produce their own food     3     the help of sunlight.Cactuses have spines on their stems, which can stop the water in it from     4     (evaporate使蒸发).It has a very good root system to take in water from the underground.It stores water in its body.

In some times of the year, cactuses have flowers and even fruits.However, their flowers usually last only for a few days to a few weeks.These days cactuses become very popular and are used widely    5     ornamental（装饰的）plants in houses and offices etc for their beauty.They are also main food of animals     6     (live) in deserts as cactuses contain water important for their survival.What’s more, they can also be made into delicious dishes or foods at table.     7     , cactuses have been spread almost everywhere all around the world.

These are more than 4000 different varieties of cactuses     8     (find) all over the world.They are quite different     9     their sizes, colors and shapes.The Asian biggest cactus garden lies in Panchkula, sector 5 in north India.It is a very big cactus garden and there are hundreds of varieties of cactuses over there.In some varieties, leaves are present but in very reduced form.The American biggest cactus garden lies in Mexico,     10     some species can grow up to 15-20 feet tall like big trees.