2021龙岩质检语文数学英语地理试题及参考答案

2021龙岩质检语文试题及参考答案

2021龙岩质检数学试题及参考答案

2021龙岩质检英语试题及参考答案

2021龙岩质检地理试题及参考答案

第二节（共10小题；每小题1.5分，满分15分）

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

Young sunflowers face the sun as it rises in the east and follow it across the sky until it sets in the west. Why does this happen? A team of scientists has finally been able to figure __61__ how and why young sunflowers move.

Older sunflowers always face east. However, as it __62__(turn) out, an internal（内部的）clock helps young sunflowers track the sun so that they can grow better. US biologist Stacey Harmer and her colleagues had it __63__ (explain) in a recent paper published in the journal Science on Aug. 5.

__64__ (depend) on the time of day, certain growth genes seem to work to different degrees on different __65__ (side) of young sunflowers’ stems（茎）. The east side of their stems grows faster during __66__ day, causing the stems to __67__ (gradual) bend from east to west. The west side grows faster at night, preparing them for the next morning.

All this move is highly __68__ (benefit) to sunflowers. The team found that flowers kept away from the sun had leaves __69__ were 10 percent smaller on average. According to Harmer, sunflowers which __70__ (face) with the sun receive more bees and other insects because they like warm flowers.