题目内容：

Bees seem to fly aimlessly as they search for the sugary liquid called nectar (花蜜). But their flight plans actually do have a pattern. Flowers act as the insects’ air-traffic controllers. And new research shows bees prefer flowers that aren’t too flashy.

Flowers give bees clues about how much a plant can offer. Those clues can be in the color of petals, in the type, in the smell or even in the electrical charge. All of these characteristics send signals to the bees, telling them whether to land or not, among which the colors play the most significant role. The insects keep track of the color of the flowers that are especially rich in nectar. They then visit more flowers of that color.

However, color can’t guarantee bees a good meal. It may change depending on the angle at which sunlight hits its petals. A yellow follower, for example, may look somewhat blue from one angle and red from another. Beverley Glover studies plants at the University of Cambridge in England. Glover and her colleagues showed that even when the color of petals looks similar, bees behave differently in searching for nectar. They started to guess that the strength of petals’ indescence (色彩斑斓) might be related to how bees find the petals.

Glover and her colleagues tested their hypothesis in the lab. In their experiment, they found that bees felt confused sometimes when the petals were very iridescent and that bees had no problem finding the flowers with more nectar when the petals were not very iridescent. The team shared its new findings in the March 21 Current Biology.

“At first glance, it’s very surprising because animals can usually detect a more vivid signal more easily,” says Klaus Lunau, a biologist in Germany, who was not involved in the study.

1.What can we know about the flight of bees?

A. They usually fly in a regular pattern.

B. They fly under the direction of flowers.

C. They usually fly without any purpose.

D. They fly to some very flashy flowers.

2.What is the most important clue for bees to search for nectar?

A. The petals’ type.    B. The followers’ smell.

C. The followers’ electrical charge.    D. The petals’ color.

3.What does the underlined word “hypothesis” in Paragraph 4 probably mean?

A. Discussion.    B. Method.

C. Assumption.    D. Invention

4.What is the new finding of the team?

A. Petals that are not very flashy are better for bees to make adjustments.

B. Petals of different color usually give different signals.

C. Petals that are vivid are detected by bees more easily.

D. Petals of different types make bees confused to find the right flower.