题目内容：

    Pachyrhynchus weevils (球背象鼻虫) are found on most islands in the eastern Pacific Ocean. These weevils could not fly. But why are they so widespread? Wen-San Huang of the National Museum of Natural Science in Taiwan thinks he has the answer.

One theory, which dates back to 1923, is that the beetles float from place to place by a tiny air cavity beneath its outer shell.

Dr Huang began his research into the weevils and discovered that the beetles do float. But he also reports floating in seawater does not do them much good. All 57 adults he tried it with died within two days. Clearly, adult weevils are not good sailors.

Pachyrhynchus weevils have a love for laying their eggs inside the fruit of a plant called the fish-poison tree. This reproduces reminding us of coconut palms. It drops its fruits into the ocean, which carries them away to come up on distant beaches. Coconuts are protected from being eaten on their travels by having a hard, thick shell. Fish-poison-tree fruit are also protected from hungry sea creatures. But in their case, as their name suggests, the protection is chemical.

Given the relationship between weevils and plant, Dr Huang wondered how beetle larvae (幼虫) would fare if they were deep inside a piece of fruit floating in seawater.

So he tested this as well. His experiment suggested that such larvae are 'tolerant of saline (含盐的) conditions.

Specifically, of 18 grubs (蛆) thrown into seawater inside a piece of fruit, two survived for six days. Moreover, these larvae went on to develop into healthy, sexually mature adults. So Dr Huang argues that such numbers would easily support the immigration of weevils to the islands.

He also observes that the Kuroshio Current, which carries water from the Philippines, past Japan and onwards into the Pacific, moves so swiftly that a piece of fruit caught in it could easily travel 90km in a day, enabling the flightless beetle to cover the distance of 400km between the islands effectively.

1.What did Wen-San Huang find in his research?

A.The old theory accounts for weevils. B.Adult weevils are good at floating.

C.Fish-poison-tree fruit protect weevils. D.The weevils cross the islands in a day.

2.What can the underlined word "fare" probably mean?

A.Survive. B.Travel.

C.Grow. D.Float.

3.How do weevils succeed in immigrating between the islands?

A.By travelling with sea creatures.

B.By wearing shells for protection.

C.By laying eggs in coconuts sinking under the sea.

D.By staying in the floating fish-poison-tree fruits.

4.What's the author's purpose of writing the text?

A.To introduce the research result.

B.To compare the coconut palms and weevils.

C.To tell how weevils immigrate to the islands.

D.To praise Wen San Huang for his research.