1. This soup is made from black beans. It is black soup. A bean b beans c bean`s d beans` 2

c) it turned out possible to code a person's slumber to awake at a particular time
d) sleep researchers order to sleep as much as possible


490. Sleep researchers have found that people can make themselves wake up at a given time simply by deciding to do so before they go to sleep. Scientists took two groups of volunteers and, at nightfall, told one group that they would be woken at 6 a.m. and the other that they would be woken at 9 a.m. The sleepers' levels of the hormone adrenocorticotropin, which is known to cause spontaneous awakening, were then measured. In each group, there was a rise in the levels of the hormone one hour before the volunteers expected to get up. The three-hour difference between the rise in hormones in the two groups suggests that the body can be programmed to wake up on command.
The research in the passage points out that...
a) people who wake up at 6 a.m. and who wake 9 a.m. have the same hormones.
b) scientists conducted their research only among heavy sleepers.
c) one can definitely suggest the time of awakening.
d) the hormones that wake people up have a three-hour long cycle


491. Sleep researchers have found that people can make themselves wake up at a given time simply by deciding to do so before they go to sleep. Scientists took two groups of volunteers and, at nightfall, told one group that they would be woken at 6 a.m. and the other that they would be woken at 9 a.m. The sleepers' levels of the hormone adrenocorticotropin, which is known to cause spontaneous awakening, were then measured. In each group, there was a rise in the levels of the hormone one hour before the volunteers expected to get up. The three-hour difference between the rise in hormones in the two groups suggests that the body can be programmed to wake up on command.
The researchers carried out their experiment...
a) during a solar day b) over the entire circadian period
c) during lunar day d) at dusk


492. Have you ever seen a metallic green bug buzzing around in the summertime? It's a June bug. June bugs get their name because they emerge as adults at the beginning of summer. It takes a year for a June bug to complete its full life cycle.
A June bug is an insect with six legs. It has a dull, metallic - green body with wings. Its underside is light brown or black. The June bug is a member of the beetle family. June bugs will gather in clusters and eat ripened apples, peaches, pears, or any other fruit. When the beetle is still a grub, it will feed on decaying matter, grass, and other plants. These grubs will also go underground to eat plants such as sweet potatoes and carrots.
In the past, a fun summer activity for many children was to catch June bugs. Children would tie a string to one of the legs and then let the .June bug fly around while holding the string. This provided hours of entertainment for children. Some children still participate in this activity today.