第二篇：
Hundreds oi different species of plants and animals have arrived m the United States. This numoer has increased greatly as international travel and business have increased. Some of these new “ _____36_____ ” have caused problems for agriculture or the environment. The Mediterranean fruit fly, _____37_____ , arrived in California on some imported fruit in 1970s. In its original home, it had never caused much damage. In California, however, it _____38_____ so quickly that the California fruit industry was soon in trouble. The government had to take serious measures to try to kill the flies, but have not managed to get rid of them altogether. Sometimes the damage caused by an immigrant species is not measurable in dollars. It may not harm us directly, but it may change the environment. And that may cause proolems for the _____39_____ plants or animals that were living there before. Loosestrife is a plant that came to North America sometime in the 19th century. It may have been carried as seeds on the back of some sheep from Europe, or someone may have brought the seeds to plant in their garden. _____40_____ ，loosestrife now grows along rivers and lakes all over North America. It is a pretty plant, but when a lot of loosestrife grows in one place, other plants cannot grow there.
【題組】40.
(A) Of course
(B) In any case
(C) By contrast
(D) On the whole
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