更多"There are many kinds of ants in Ame"的相关试题:
[单项选择]There are many kinds of ants in America. One kind is very strong. People are afraid of it, and animals are afraid of it, too.
These ants move in large groups. They eat all the animals on their way. They can kill and eat elephants, anti they can eat wood houses. Sometimes even people are killed by them. When the ants come near, people leave their homes. But people are sometimes glad after the ants pass, because they can see no insects (昆虫) or snakes.
What do people do when the ants come near
A. They kill them.
B. They live as usual.
C. They leave their homes.
[单项选择]
There are many kinds of ants in
America. One kind is very strong. People are afraid of it, and animals are
afraid of it, too.
These ants move in large groups. They eat all
the animals on their way. They can kill and eat elephants, anti they can eat
wood houses. Sometimes even people are killed by them. When the ants come near,
people leave their homes. But people are sometimes glad after the ants pass,
because they can see no insects (昆虫) or snakes. |
The strong ants move ______ .
[单项选择] Many ants forage across the countryside in large numbers and undertake mass
migrations; these activities proceed because one ant lays a trail on the ground for the others
to follow. As a worker ant returns home after finding a source of food, it marks the route
by intermittently touching its stinger to the ground and depositing a tiny amount of trail
(5)pheromone—a mixture of chemicals that delivers diverse messages as the context changes.
These trails incorporate no directional information and may be followed by other ants in
either direction.
Unlike some other messages, such as the one arising from a dead ant, a food trail has to
be kept secret from members of other species. It is not surprising then that ant species use
(10)a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these
signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated
that one milligram
A. The mass migration of ants
B. How ants mark and follow a chemical trail
C. Different species of ants around the world
D. The information contained in pheromones
[填空题]Varying the kinds of sentences is one path of effecture writing.
[单项选择]Lincoln, who many regard as one of our great presidents, was often______despite his reputation of telling good jokes.
A. bright
B. optimistic
C. gloomy
D. cheerful
