内容正文:
民到29.Whichof the following can replace the underlined word "sophisticated" in paragraph 3?
A. Unimportant. B. Permanent. C.Complicated. D. Imaginary.
30.Why is playful wresting mentioned in the text?
A. To indicate that hide-and-seek is much easier.
B. To indicate that hide and-seek is more fascinating.
C.To indicate that hide and seek is more adventurous
D. To indicate that hide-and-seek is more challenging.
31.What can we learn from the text?
A.Evolution brings the rats the ability to play.
B. Rats are born with the ability to play socially.
C.Hide-and-seek helps rats improve their social ability.
D. Adult rats tend to play more often than young ones.
D
People have different ways of dealing with a common cold. Some take over-the counter
(非处方的)medicines such as aspirin while others try popular home remedies (治疗)]ike
回:5crbal tea or chicken soup. Yet, here is the tough truth about the common cold: nothing
really cures you of it.
So why do people sometimes believe that their remedies work?According to James
bε-Taylor,professor at the University of Washington, colds usually go away on their own in
about a week, improving a little each day after symptoms peak, so it's easy to believe it's
(⋮ medicine rather than time that deserves the credit.
It still seerms hard to believe that we can deal with more serious diseases yet we are
∠РOWerless against something so common as a cold. Recently, scientists came closer to figuring
out why. To understand it, you first need to know how antiviral(抗病毒的)drugswork.
They attack the virus by attaching to and changing the surface structures of the virus. To do
ζ」that,the drug must fit and lock into the virus like the right piece of a jigsaw(拼图),which
means scientists have to identify the virus and build a 3D model to study its surface before they
或密can design an antiviral drug that is effective enough.
The two cold viruses that scientists had long known about were rhinovirus(鼻病毒)A
and B. But they didn't