Space is a dangerous place，not only because of meteors but also because of rays from the sun and other stars．The atmosphere again acts as our protective blanket on earth．Light gets through，and this is essential for plants to make the food which we eat．Heat，too，makes our environment endurable．Various kinds of rays come through the air from outer space，but enormous quantities of radiation：from the sun are screened off．As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft。if they are inside，do prevent a lot of radiation damage．

Radiation is the greatest known danger to explorers in space．The unit of radiation is called “rem”．Scientists have reason to think that a man can put up with far more radiation than 0.1ream without being damaged；the figure of 60 reins has been agreed on．The trouble is that it isextremely difficult to be sure about radiation damage--a person may feel perfectly well，but theCells of his or her sex organs may be damaged，and this will not be discovered until the birth ofdeformed(畸形的)children or even grandchildren．Missions of the Apollo flights have had tocross belts of high radiation and，during the outward and return joumeys，the Apollo crew ac—cumulated a large amount of reams．So far，no dangerous amounts of radiation have been repor-ted，but the Apollo missions have been quite short．We simply do not know yet how men aregoing to get on when they spend weeks and months outside the protection of the atmosphere，working in a space laboratory．Drugs might help to decrease the damage done by radiation，butno really effective ones have been found so far．

根据以上内容，回答下列各题。

1．广告正走进人们的生活。

2．广告能提供我们大量的信息。

3．然而，广告不一定都真实。

__________.

__________.

__________.

A．See you this evening

B．Ive gotta run

C．See you again

D．won’t be back for supper

E．Ill go to the office

F．Take care

G．Don’t worry

H．Ill just take the subway

Gary：Dear，I have to go to the office early today．Can you take Sally to school?Ada：Sure．Want me to give you a ride?

Gary:N0，forget it． ____56____ ．it’s very quick．Ill pick Sally up this afterrnoon．You can just come home after work．

Ada：Ok．Oh，I almost forgot．I probably 57．Ive made an evening appointment

with Mr．Steven to talk about our next project．

Gary：Oh，I see．____58____．Hurry Sally up a little．She hasnt even had her breakfast yet．Ada：Ok． ____59____．Love you，honey．

Gary：I love you，too．____60____．

根据以上内容，回答下列各题。

__________.

__________.

The application of infrared scanning technolgy to agriculture met with some difficul-ties due to_________．

Plants will emit an increased amount of heat when they are_________

Farmers can save a considerable amount of pesticide by_________．

Even plants can run a fever，especially when they’re under attack by insects or disease．But unlike humans，plants Can have their temperature taken from 3,000 feet away—straightup．A decade ago，adapting the infrared(红外线)scanning technology developed for militarypurposes and other satellites，physicist Stephen Paley came up with a quick way to take thetemperature of crops to determine which ones are under stress．The goal was to let farmers pre-cisely target pesticide(杀虫剂)spraying rather than rain poison on a whole field，which in-variably includes plants that don’t have pest(害虫)problems．

Even better．Paley’s Remote Scanning Services Company could detect crop problems be-fore they became visible to the eye．Mounted on a plane flown at 3，000 feet at night，an infra-red scanner measured the heat emitted by crops．The data were transformed into a color-codemap showing where plants were running“fevers”．Farmers could then spot-spray，using 50 to70 percent less pesticide than they otherwise would．

The bad news is that Paleys company closed down in 1984，after only three years．Farm,ers resisted the new technology and long-term backers were hard to find．But with the　renewedconcem about pesticides on produce，and refinements in infrared scanning，Paley hopes to getback into operation．Agriculture experts have no doubt the technology works．“This techniquecan be used on 75 percent of agricultural land in the United States"，says George Oerther ofTexas A&M．Ray Jackson，who recently retired from the Department of Agricuhrue，thinks re-mote infrared crop scanning could be adopted by the end of the decade．But only if Paley findsthe financial backing which he failed to obtain 10 years ago．

根据以上内容，回答下列各题。

In order to apply pesticide spraying precisely，we call use infrared scanning to _________.