Global warming could make humans shorter. Scientists claim to have found evidence that it caused the world's first horses （shrink） nearly 50 million years ago. In fact,a team from the universities of Florida and Nebreaks says
has found a link between the Earth heating up and the size of mammals-homes，during the last time the world heated up. The scientists used fossils to follow the evolution of homes from their earliest
（appear) 56 million years ago. As temperatures went up．their size went
. The scientists say that the current warming could have the same effect
mammals and could even make humans
（small）．“Horses started out small，about the size of a small dog. What's
（surprise）is that after they first appeared，they then became even smaller and then dramatically increased in size, and that
（exact）corresponds to the global warming event, followed by cooling.”"It had been known that mammals
small during the last warm time，
we hadn't realized that temperature specifically was driving the evolution of body size”Dr. Bloch said in the "Science”journal.
阅读下面材料，在空白处填入适当的内容（每空1词）或括号内单词的正确形式。
Freeflyers: Modem Skydivers
Have you experienced the thrilling sport—freeflying? Imagine falling towards the planet Earth at awesome speed of 300 kilometers per hour. You start your fall from over four kilometers above the Earth. And you have less than one minute before you pull your parachute (降落伞）cord. You are falling
fast that just turning your head can send you off
a different direction. This is the wild side of a sport that has not found its limit—freeflying.
Freeflying (base) on the more traditional skydiving,
of which are eye-catching. However, it is more terrifying to watch freeflyers create formations and movements. Freeflyers,
the name suggests, enjoy the more spontaneous(即兴的）thrill of doing their own things.
The wildest trip for a freeflyers is falling ‘head down’. Falling ‘head first’ requires a great deal of control, which means(travel) not only fast but also steadily. Even the
(slight) movement has a great effect on your direction.
They wear the amusing jumpsuits, strange helmets and smaller parachutes. (actual), their parachutes are about one quarter the size of the traditional skydiver’s parachutes. It is only in the last few years
freeflying has gained any real public acceptance.
A: Sir, are you free now? I want ____ (talk) with you.
B: Sure, go ahead. What is ____?
A: I ___ (real) want to change my neighbor.
B: Oh, but why? __ you had a quarrel?
A: No, we haven’t.
B: Well, as I know, since you became neighbors, you ___ (be) friendly to each other.
A: Yes. But … but you don’t know that he’s a chatter-box. He talks in and out of class all the time, ___
affects my studies a lot!
B: I’m sorry I ___ (know) that. I think I should have a word __
__ him. And let’s see if he will change.
A: All right. I’ll wait a few days. If he still talks like that, I ____ (change) my seat.
B: Okay. Anyway, having a good neighbor is __ (importance) thing.
The air we breathe is freely available, withoutwe could not survive more than a few minutes. For the most part, air is available to everyone, and everyone needs it. Some people use the air to sustain them while
(sit) around and feel sorry for themselves.
breathe in the air and use the energy it provides to make
magnificent life.
Opportunity is in the same way; it is everywhere. It is so freely available that we take it granted. Yet opportunity alone is not enough to create success; it must
(seize) and acted upon in order to have value. So many people are so
(anxiety) to “get in” on a “ground floor opportunity”, as if the opportunity will do all the work. That’s
(possible).
Just as you need air to breathe, you need opportunity to succeed., it takes more than just breathing in the fresh air of opportunity. You must make use of it. That’s not up to the opportunity; that’s up to you. It doesn’t matter what “floor” the opportunity is on, but
matters is what you do with it.
Not all ads play tricks us, though. PSAs use some of
same methods as commercial ads, like attractive pictures and clever language. They aim to teach us and help us
better lives. Our government has been using PSAs to educate people
many years. One of these is, “
you smoke cigarettes, you are slowing killing
. All of these ads
meant to benefit the public, and you can often learn a lot by following the advice they give. Finally, when
comes to advertisements, we must be intelligent and not be a slave to them.
Most Americans don’t like to get advice ___ (strange)”. When they need advice, they don’t usually go to people they know. Instead， many of them write
to newspapers and magazines ___
give advice on many different subjects
(include) family problems, the use of language, health, cooking, child care, clothes, and even on how to buy _
house or a car.
Most newspapers(regular) print letters from readers with problems. Along with letters there are answers written by people who are supposed to know
to solve such problems. Some of these writers are doctors, _
__ are lawyers or educators. But two of the most famous writers of advice are women without special
(train) for this kind of work.